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Purpose: The purpose of this study was to investigate the influence of sign characteristics in a key word signing (KWS) system on the functional use of those signs by adults with intellectual disability (ID). Method: All 507 signs from a Flemish KWS system were characterized in terms of phonological, iconic, and referential characteristics. Phonological and referential characteristics were assigned to the signs by speech-language pathologists. The iconicity (i.e., transparency, guessing the meaning of the sign; and translucency, rating on a 6-point scale) of the signs were tested in 467 students. Sign functionality was studied in 119 adults with ID (mean mental age of 50.54 months) by means of a questionnaire, filled out by a support worker. Results: A generalized linear model with a negative binomial distribution (with log-link) showed that semantic category was the factor with the strongest influence on sign functionality, with grammatical class, referential concreteness, and translucency also playing a part. No sign phonological characteristics were found to be of significant influence on sign use. Conclusion: The meaning of a sign is the most important factor regarding its functionality (i.e., whether a sign is used in everyday communication). Phonological characteristics seem only of minor importance.

Background: Although high-structured elicitation tasks have been shown to be efficient means to sample communication in children with intellectual disabilities, their validity and reliability remain to be evaluated. The aims of this study were threefold: (i) to evaluate the eliciting potential, (ii) to examine the utterance forms of proto-imperative and proto-declarative intentions, and (iii) to evaluate the reliability of two high-structured elicitation tasks. Methods: Twenty-eight children with intellectual disabilities participated in a standard assessment battery, consisting of a formal language assessment, a parent questionnaire, an elicitation task for proto-imperatives, and an elicitation task for proto-declaratives. Results: The elicitation tasks elicited significantly more proto-imperatives than proto-declaratives; with proto-imperatives being predominantly expressed with gestures and proto-declaratives predominantly with vocalizations. Furthermore, medium to large correlations were found between the elicitation tasks and the other communication and language instruments. Conclusions: Several factors need to be considered to account for the observed differences in frequency and utterance forms of the elicited proto-imperatives versus proto-declaratives. Nevertheless, the results overall suggest that the elicitation tasks for proto-imperatives and proto-declaratives can be reliably used in children with intellectual disabilities.

Recently, several instruments have been developed to measure the subjective component of the quality of life (QOL) of people with profound intellectual and multiple disabilities (PIMD). A next step, however, must be the further validation of these instruments. The present study aimed at evaluating the psychometric properties of one of these instruments, the Dutch version of the Mood, Interest and Pleasure Questionnaire (MIPQ). The MIPQ is a 25-item Likert scale questionnaire with two subscales (Mood and Interest and Pleasure). The MIPQ and the Aberrant Behavior Checklist were completed on 360 participants with severe or profound intellectual disabilities. About 27% of these participants were included in an examination of test-retest of and the inter-rater reliability of the MIPQ. The results suggest that the proposed two-factor structure did not show an adequate fit to our data. An exploratory factor analysis revealed a three-factor structure with positive mood, negative mood and interest as three correlated but distinct subscales. These results are in concurrence with the literature on positive emotions. High internal consistency (alpha greater than or equal to 0.80), high inter-rater (r greater than or equal to 0.69) and high test-retest reliability (r greater than or equal to 0.86) were found, which indicates the reliable use of the MIPQ in the population of people with PIMD. Strong negative correlations between the MIPQ total score and the Aberrant Behavior Checklist's "lethargy, social withdrawal" subscale provides some evidence of the construct validity of the MIPQ. However, further validation of the MIPQ including other measures of subjective well-being is warranted. (Contains 5 tables.)

Background: This study evaluates the effects of reminiscence group work on the subjective well-being of ageing people with intellectual disabilities. Methods: The content of the successive group work sessions was manipulated as follows: a control-phase with three "current topics" sessions, an experimental phase with six "reminiscence" sessions and finally three "current topics" sessions. Life satisfaction, perceived self-competence and mood were measured by questionnaires, filled in by the participants and direct support workers. Results: A quasi-experimental pre-test-post-test design (n = 41) did not detect any changes in life satisfaction and perceived self-competence. For mood, a quasi-experimental ABA-design (n = 41) did not yield an experimental treatment effect, but a significant increase in scores was observed over time. Personality characteristics "extraversion" and "emotional stability", but not memory specificity were found to be significant covariates for the mood scores. Conclusion: Although the study's design did not allow us to confirm the effect of reminiscence group work, the analysis nonetheless revealed some useful indications for further research. Also, interviews conducted before and after the programme resulted in positive appraisals of the programme as a worthwhile and meaningful activity for ageing people with intellectual disability.

Because of a shortage of valid instruments to measure the QOL of people with profound multiple disabilities (PMD), the QOL-PMD was developed. In the present study, possibilities for item reduction as well as the psychometric properties of the questionnaire were examined. One hundred and forty-seven informants of people with PMD participated in the study. Fifty items were removed from the questionnaire on the basis of preset criteria. Internal consistency was good for the total questionnaire as well as for the subscales. Evidence of the construct validity of the questionnaire was found. Correspondence between the groups of informants was moderate. The results of this preliminary analysis of the psychometric properties of the QOL-PMD are encouraging, but further validation of the measure is warranted. (Contains 6 tables.)

The present study focused on the objective components of quality of life (QOL) of people with profound multiple disabilities (PMD). More specific, we aimed at evaluating different dimensions of QOL of people with PMD and investigating the association between their QOL and several personal (age, gender, intellectual capabilities, motor limitations, sensory limitations, physical and mental health status) as well as setting characteristics (location of the setting, type of setting, size of the setting, group size, group composition, staffing level and staff turnover). As a measure of the QOL of people with PMD we used the QOL-PMD, a questionnaire that we specifically developed for this purpose. To measure the personal and setting characteristics we also used a self-developed questionnaire. Forty-nine people with PMD were selected. For each of these people three informants were chosen who each filled out the QOL-PMD. To account for the clustered nature of the data, data were analysed by means of mixed models. Characteristics regarding the medical condition of the person with PMD turned out to be most strongly associated with the QOL-PMD scores. Other personal characteristics such as age, gender, motor limitations and sensory limitations did not have a significant effect on the QOL-PMD scores. With regard to the setting characteristics, location of the setting and staffing level turned out to have a significant effect on the QOL-PMD scores. (Contains 4 tables.)

The authors attempted to find out to what extent and in which ways, in Belgium, have Flemish services for people with intellectual disability adapted to the specific needs of aging people. A study was undertaken and a questionnaire was developed to address the following research topics: (1) accommodations and personnel, (2) staff working methods, and (3) staff views and attitudes. The questionnaire was completed by 66 coordinating staff members in as many facilities. At the time of our study, these services supported 310 (27%) persons with Down syndrome age 40 years and older and 833 (73%) persons with intellectual disability (other than Down syndrome) age 55 years and older. Adaptations in accommodation and personnel management were obvious in the majority of the participating services. The working methods reflected a person-centered philosophy, regardless of the age-factor. An exploratory factor analysis revealed three different staff approaches: an activating/socializing, disengaging, and methodical. Participation in activities and involvement in social relations have a prominent place in the staff's views. In general, the authors found that about two-thirds of the services have started to modify their accommodation and personnel to the needs of aging people with intellectual disability. The authors note also that the results suggest there is still a lot of work to do in improving staff training, introducing specific working methods, and in altering stereotypical staff attitudes to assure a good "aging in place."

Background: The aim of this study was to explore a procedure for drafting individualised profiles of how people with profound multiple disabilities express pleasure and displeasure. Method: There were 6 participants with profound multiple disabilities. The procedure involved an observational analysis of videotaped critical incidents by a researcher and a questionnaire for parents and support workers. Results: The procedure is useful for making an individualised profile of the ways a person with profound multiple disabilities expresses his/her pleasure and displeasure. Despite the significant correlation between parents, support workers and the researcher, each has a complementary contribution to make in identifying affective expressions. People with profound multiple disabilities especially use sounds and facial expressions to express pleasure and displeasure and positive or negative moods. Conclusions: The procedure may be useful in services or schools for learning more about the affective communication of these individuals, to determine their specific interests, and to evaluate the effects of living and support characteristics on their well-being.

The communicative behavior of young children with significant cognitive and motor developmental delays is generally considered to be limited, idiosyncratic and non-intentional. At present, changes between and within children over time regarding their communicative behavior are hard to detect. This article describes an exploratory observational study that draws on data from the first data point of 38 children who are participating in a longitudinal project on the developmental trajectories of children with significant cognitive and motor developmental delays. The aims of this study were to (a) describe the participants' communicative behavior in detail with communication-related variables that reflect differences across individuals, (b) create summarizing variables and (c) explore whether subgroups of children can be detected. A self-developed coding scheme and descriptive statistics combined with correlational analyses were used, followed by a principal component analysis and visual inspection of the outcome of this analysis. The within-group differences related to communicative behavior was characterized using 16 variables. Based on these variables, three overarching components were formulated: communication proficiency, Expressions of Discomfort and Rejection and Differentiation According to Focus. All participating children were found to be unique in terms of their component scores and the relationship among their component scores. [ABSTRACT FROM AUTHOR]

In the transition period between adolescence and young adulthood, individuals with 22q11.2DS are at an increased risk of developing severe psychiatric disorders. Various studies have focused on detecting risk factors, but until now protective factors are still understudied in 22q11.2DS. The current case–control study focuses on the role of resilience and quality of life (QoL) in young adults with 22q11.2DS and behavioural problems, in comparison with persons with an intellectual disability (ID) without a known genetic disorder. Self-report (and caregiver report) standardized questionnaires were used. Predictive general linear models were constructed to compare the resilience and quality of life across both groups (22q11.2DS vs ID-group) and to analyse the association between personal characteristics in both groups. Young adults with a 22q11.2DS show less resilience compared with both the general population norms and young adults with ID. Only a subscale of resilience (Acceptance of self and life) contributes to the reported level of QoL. Reported health problems are not related to resilience, but have an important effect on QoL. Our results suggest different factors are underlying resilience and the relation with QoL in 22q11.2DS and ID in general. These factors deserve more research and are important to take into account in clinical practice. [ABSTRACT FROM AUTHOR]

Background: Evidence shows that neurotypical individuals who stutter use fewer gestures than those who do not stutter. Presently, no research exists about the interaction of stuttering and gestures in individuals with Down syndrome. Method: Twenty‐nine individuals with Down syndrome (7–19 years) of whom 16 stuttered and 13 spoke fluently and 20 neurotypical children (3–10 years) of whom 8 stuttered and 12 spoke fluently participated in this study. In spontaneous speech transcriptions, stuttering events and gestures were coded. Results: Comparisons of gesture frequency during stuttered and fluent speech inside the Down syndrome and neurotypical group show that the Down syndrome group uses significantly more gestures during stuttered than during fluent speech while no significant difference is seen in the neurotypical group. Conclusions: There is some preliminary evidence that individuals with Down syndrome try to compensate for their stuttering events, however, analyses on word level are necessary to confirm a successful compensation. [ABSTRACT FROM AUTHOR]

Background: It is generally acknowledged that parent social support is an important target for intervention. To explore the specific needs of parents of young children with a significant cognitive and motor developmental delay (SDD), we aim to chart the sources and perceived sufficiency of the social support they receive. Method: Within the context of a broader project, 42 parents of a young child with SDD filled out a questionnaire on contextual factors, including information on social support. Results: The majority of parents reported to receive (more than) sufficient support. Insufficiency is primarily reported with regard to practical support. Apart from the partner, grandparents of the child were the most common source of support. Conclusions: This study confirms the importance of professional support and work‐life balance within this specific target group. Specific attention for practical support needs seems warranted considering the high basic care needs of these children. [ABSTRACT FROM AUTHOR]

Persons with profound intellectual disability (PID) are mostly not able to use assistive technology (AT) independently. Caregivers play an important mediating role in implementing AT in the daily life of persons with PID. Both first-order barriers, extrinsic to caregivers, and second-order barriers, intrinsic to caregivers, influence the attitudes and behaviors of caregivers with regard to AT-use. It could be asked if increased knowledge on and experience with AT may impact the effect of first- and second-order barriers. This study investigated how knowledge and experience influence the professional caregivers' beliefs about which factors may impact the AT use in persons with PID and their intentions to use AT for persons with PID. A questionnaire on the experienced limitations and successes in using AT was developed. The questionnaire was send to professionals working with or responsible for persons with PID in various countries in Europe. In total the answers of 195 respondents were included in this study. This study's results demonstrate that AT is used for various reasons in persons with PID, mostly to support communication and interaction or for fun or relaxation. Based on the answers of the respondents can be concluded that both experience and knowledge of caregivers seem to influence first- and second-order barriers. Besides, a possibility to overcome the second-order barriers is to provide professionals with possibilities to increase their knowledge and experience. AT for persons with PID is mostly used for communication and interaction or for fun and relaxation. Professional caregivers belief that AT-use may positively influence various aspects in the life of persons with PID, especially communication and interaction, active engagement and participation in activities, and self-esteem of the person. Caregivers need to have sufficient experience in order to rate the barriers of AT-use as less limited in the group of persons with PID. In order to overcome the barriers experienced in implementing AT in persons with PID, knowledge of caregivers is essential. [ABSTRACT FROM AUTHOR]

Despite the high prevalence of visual impairments in persons with severe or profound intellectual disability (ID), often a formal diagnosis is unavailable. Direct support workers and staff members have access to the information of the visual functioning through the personal files and build knowledge based on their own experiences. In order to provide individualized and high quality support in daily life, the accuracy and availability of this information of the visual functioning is essential. This study investigates the knowledge of direct support workers and staff members on the visual functioning of their clients and the written information available in the personal files. It is investigated to what extent they do agree on their knowledge and how certain direct support workers and staff members are about their knowledge on the visual functioning. Additionally is investigated to what extent the information available in support files is based on formal assessment. For 104 clients with severe or profound ID a direct support worker and a staff member filled in a questionnaire about their visual functioning. Next, the personal files were analyzed. Direct support workers and staff members respond significantly differently on the questions on the impaired visual functions. Direct support workers rate the certainty level of their knowledge on their clients' visual functions higher than staff members. The personal files lack information on the visual functioning. If information is available, it is mostly based on subjective impressions. The knowledge of direct support workers and staff members and the information available in the personal files provide no comprehensive picture of the visual functioning of the persons with severe or profound ID. [ABSTRACT FROM AUTHOR]

Background: Everyday activities are an important setting for stimulating child functioning, but are understudied in young children with a significant cognitive and motor developmental delay. Therefore, we aim to characterize their family activities in terms of diversity, frequency, child engagement and family member's presence, compared to typically developing children. Methods: By asking a parent to fill out an adapted version of the Child Participation in Family Activities questionnaire, the activity pattern of 49 children within the study group and 45 children within the control group were assessed and compared. Results: Children in the study group generally experience less diverse activities (with an additional lower frequency of out‐of‐home activities) and show lower engagement levels compared to typically developing children. Conclusions: Incorporating high levels of personal interaction, highly stimulating activities and adapted leisure activities into the daily activity pattern of children with multiple disabilities might be a pathway to increased engagement levels. [ABSTRACT FROM AUTHOR]

Background: The hallmark of attachment is that contact, proximity and relief from stress are sought from specific individuals, laying important groundwork for healthy socioemotional functioning. This study investigated the extent to which differentiated attachment behaviour can be observed in young children with significant developmental delay (DD). Method: Video‐taped observations of the parent–child and stranger–child interaction were conducted at home and complemented with questionnaires in 20 families with a child with significant DD (age 2–7 years with an average DD of 49 months). Results: Children displayed more intense and persistent contact‐seeking, contact‐maintaining and resistant behaviour in the episodes with their parent compared to the episodes with the stranger. Parent‐reported secure attachment behaviour was slightly more characteristic towards mother compared to father. Conclusions: Even children with significant DD develop differentiated attachment behaviour. Detailed observations may support parents in identifying the interactions that make the attachment relationship with their child special. [ABSTRACT FROM AUTHOR]

Background Children with profound intellectual and multiple disabilities ( PIMD) meet other children with PIMD in day care centres or schools. This study explores the peer-directed behaviours of children with PIMD, the peer interaction-influencing behaviour of the direct support workers and the children's positioning. Method Group activities for children with PIMD initiated by a direct support worker were video-recorded. The behaviour and positioning of the children and the behaviour of the direct support workers were coded. Results Limited peer-directed behaviour of the children with PIMD and peer interaction-influencing behaviour of the direct support workers are observed. Weak associations were found between the positioning or peer interaction-influencing behaviours and the behaviour of children with PIMD. Conclusions Children with PIMD show social interest in each other during group activities. More knowledge is needed to create an environment which facilitates peer-directed behaviours of persons with PIMD. [ABSTRACT FROM AUTHOR]

Multisensory storytelling ( MSST) is a storytelling method developed for people with profound intellectual and multiple disabilities ( PIMD). The developers of MSST have established specific guidelines aimed at increasing the listener's attention. Whether, and to what extent, these guidelines indeed increase the listener' attentiveness is unknown. This study analyzed the relationship between the effects of these guidelines and the attentiveness of listeners with PIMD. Some 45 storytellers created an MSST book tailored to a person with PIMD. The book was read 10 times, and video recordings were made of the first, fifth, and tenth reading sessions. For each session, the percentage of attention paid to the storyteller and to the book was scored using an interval method. The relationship between adherence to the guidelines (repetition, use of original text, offering stimuli actively, and use of neutral background) and attentiveness of the person with PIMD was then analyzed. During storytelling, the listeners were attentive to MSST for an average of 69% of the time. The attention increased between the first and fifth reading sessions, and then dropped between the fifth and tenth sessions. Part of the guidelines (repetition, actively offering the stimuli and duration of the story) were positively related to the amount of the listeners' attention; for other parts of the guidelines (using original text and using neutral background), no significant correlations were found. The results of this study can help with developing clearer instructions to new storytellers. To optimize the attentiveness of a person with PIMD to an MSST story, the authors recommend that the storyteller takes ample time to read the book and provides the listener with active access to the stimuli. [ABSTRACT FROM AUTHOR]

Key word signing (KWS) is a means of augmentative and alternative communication frequently used with adults with intellectual disabilities (ID). Their acquisition of KWS has been described in the literature; however, little is known about the everyday KWS use among adults with ID and their support staff. This study aimed to give an account of the prevalence of KWS and the sign knowledge of adults with ID and their support staff in Flemish residential programs (RPs) and day care programs (DCPs). Communication specialists in all RPs and DCPs for adults with ID in Flanders, the Dutch-speaking part of Belgium, were contacted by phone and were asked whether they used KWS, and if so, whether they were willing to fill out a questionnaire about the KWS use of support staff and clients. Findings show that of 347 RPs and DCPs in Flanders, 85% met the inclusion criteria. Half (51.2%) of these programs used KWS. Of these 152 programs, 93 (61.2%) completed our questionnaire. A quarter (26.6%) of their adult clients with ID used KWS.Most of them knew 10-50 signs, whereas most support staff knew fewer than 10 signs. The presence of a speech and language therapist as well as sign knowledge and attitude of support staff were significantly related to the sign knowledge of their clients.Motivational problems for staff to use KWS were quite common. KWS support should be more widespread and more easily accessible. [ABSTRACT FROM AUTHOR]

The aim of this study was to test whether the effect of the pile-up of demands associated with a disability on quality of life, was mediated by resilience, quantity and quality of social support for adolescents with a disability and their parents. One hundred and thirty two parents, 90 mothers and 42 fathers and 111 adolescents, aged between 16 and 24 years completed measures of the pile-up of demands, social support, resilience and quality of life. Structural equation modeling with the bootstrap resampling method showed that the impact of the disability of their son/daughter on the quality of life of the parents was fully mediated through the parents' resilience and the quantity of social support and that resilience, however only partly, mediates the effect of adaptive skills on the quality of life of the adolescents with a disability. Limitations of the study and clinical implications are discussed. [ABSTRACT FROM AUTHOR]

Abstract: The present study focused on the objective components of quality of life (QOL) of people with profound multiple disabilities (PMD). More specific, we aimed at evaluating different dimensions of QOL of people with PMD and investigating the association between their QOL and several personal (age, gender, intellectual capabilities, motor limitations, sensory limitations, physical and mental health status) as well as setting characteristics (location of the setting, type of setting, size of the setting, group size, group composition, staffing level and staff turnover). As a measure of the QOL of people with PMD we used the QOL-PMD, a questionnaire that we specifically developed for this purpose. To measure the personal and setting characteristics we also used a self-developed questionnaire. Forty-nine people with PMD were selected. For each of these people three informants were chosen who each filled out the QOL-PMD. To account for the clustered nature of the data, data were analysed by means of mixed models. Characteristics regarding the medical condition of the person with PMD turned out to be most strongly associated with the QOL-PMD scores. Other personal characteristics such as age, gender, motor limitations and sensory limitations did not have a significant effect on the QOL-PMD scores. With regard to the setting characteristics, location of the setting and staffing level turned out to have a significant effect on the QOL-PMD scores. [Copyright &y& Elsevier]

Abstract: Because of a shortage of valid instruments to measure the QOL of people with profound multiple disabilities (PMD), the QOL-PMD was developed. In the present study, possibilities for item reduction as well as the psychometric properties of the questionnaire were examined. One hundred and forty-seven informants of people with PMD participated in the study. Fifty items were removed from the questionnaire on the basis of preset criteria. Internal consistency was good for the total questionnaire as well as for the subscales. Evidence of the construct validity of the questionnaire was found. Correspondence between the groups of informants was moderate. The results of this preliminary analysis of the psychometric properties of the QOL-PMD are encouraging, but further validation of the measure is warranted. [Copyright &y& Elsevier]

Abstract: The main goal of this study was to investigate whether staff members vary in their frequency reports on challenging behaviour concerning the same client. Because staff''s approaches of challenging behaviour are affected by a range of staff characteristics, we hypothesised that these staff characteristics could explain this variability between staff members. We used questionnaires to investigate the influence of staff''s age, gender, experience in working with people with intellectual disabilities, working hours, professional qualifications, sort of education, and their emotional reactions and beliefs regarding the challenging behaviour. This study involved 152 staff members and 51 clients with severe or profound intellectual disabilities who displayed self-injurious behaviour, stereotyped behaviour, and/or aggressive/destructive behaviour. A part of the variability between staff''s reports on the frequency of challenging behaviour was indeed explained by differences between the staff members. Working hours, internal attribution, gender, and experience in working with people with severe or profound intellectual disabilities turned out to be influencing variables. Summarising, staff members differ in their reports on the frequency of challenging behaviour. To get an accurate picture of a client''s challenging behaviour, perceptions of several staff members are needed. [Copyright &y& Elsevier]

Background This study evaluates the effects of reminiscence group work on the subjective well-being of ageing people with intellectual disabilities. Methods The content of the successive group work sessions was manipulated as follows: a control-phase with three ‘current topics’ sessions, an experimental phase with six ‘reminiscence’ sessions and finally three ‘current topics’ sessions. Life satisfaction, perceived self-competence and mood were measured by questionnaires, filled in by the participants and direct support workers. Results A quasi-experimental pre-test–post-test design ( n = 41) did not detect any changes in life satisfaction and perceived self-competence. For mood, a quasi-experimental ABA-design ( n = 41) did not yield an experimental treatment effect, but a significant increase in scores was observed over time. Personality characteristics ‘extraversion’ and ‘emotional stability’, but not memory specificity were found to be significant covariates for the mood scores. Conclusion Although the study’s design did not allow us to confirm the effect of reminiscence group work, the analysis nonetheless revealed some useful indications for further research. Also, interviews conducted before and after the programme resulted in positive appraisals of the programme as a worthwhile and meaningful activity for ageing people with intellectual disability. [ABSTRACT FROM AUTHOR]

• Children with significant cognitive and motor developmental delays develop regarding their communicative behavior although slowly and only detectable by analyzing several aspects of their behavior in great detail. • All communicative developmental trajectories are unique in pace and in order. • Children with better motor skills are more likely to show more progress in specific aspects of communicative behavior. • Interaction partners can facilitate development by adapting the interactions to the unique individuals' communicative skills. This study examines longitudinal changes in communicative behavior of young children with significant cognitive and motor developmental delays (SDD) and determines their individual communicative trajectories. A second focus of this study is the relation of changes in communicative behavior with motor skills. Data consists of codes resulting from a self-developed coding scheme used on observations of 23 children in three different settings and responses on a questionnaire. First, group trends were determined to find out whether communication-related variables tend to significantly change over the course of two years. Furthermore, these findings were contrasted with the individual trajectories of the children. Next, the association of initial communicative skills and (the acquisition of) specific motor skills with the change in their communicative functioning was studied. Wilcoxon Signed Ranks and correlational analyses were used to answer the research questions. Out of sixteen different variables related to communicative behavior, ten changed significantly over the course of two years. Children with more focus on prompt on the first datapoint showed a significantly larger increase of signs of functionality. Still, all children showed highly individual trajectories. Children with better motor skills on the first datapoint showed a significantly larger increase in communication rate. Results show that if a myriad of detailed variables are taken into account children with significant cognitive and motor developmental disabilities do change regarding their communicative functioning, but that they tend to all show unique developmental trajectories. Children with stronger skills in some aspects of communication and motor functioning, can be considered advantaged regarding their communicative development. [ABSTRACT FROM AUTHOR]

Abstract: Recently, several instruments have been developed to measure the subjective component of the quality of life (QOL) of people with profound intellectual and multiple disabilities (PIMD). A next step, however, must be the further validation of these instruments. The present study aimed at evaluating the psychometric properties of one of these instruments, the Dutch version of the Mood, Interest and Pleasure Questionnaire (MIPQ). The MIPQ is a 25-item Likert scale questionnaire with two subscales (Mood and Interest and Pleasure). The MIPQ and the Aberrant Behavior Checklist were completed on 360 participants with severe or profound intellectual disabilities. About 27% of these participants were included in an examination of test–retest of and the inter-rater reliability of the MIPQ. The results suggest that the proposed two-factor structure did not show an adequate fit to our data. An exploratory factor analysis revealed a three-factor structure with positive mood, negative mood and interest as three correlated but distinct subscales. These results are in concurrence with the literature on positive emotions. High internal consistency (α ≥.80), high inter-rater (r ≥.69) and high test–retest reliability (r ≥.86) were found, which indicates the reliable use of the MIPQ in the population of people with PIMD. Strong negative correlations between the MIPQ total score and the Aberant Behavior Checklist''s ‘lethargy, social withdrawal’ subscale provides some evidence of the construct validity of the MIPQ. However, further validation of the MIPQ including other measures of subjective well-being is warranted. [Copyright &y& Elsevier]