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Objectives, Purpose, or Aim: The aim of this article is to contribute to the better design of wayfinding systems by explicating the indexical properties of directional arrows and their consequences for wayfinding behavior. Background: The challenges associated with designing for the wayfinding needs of the different groups of users continue to be documented with the poor design of built environments being largely to blame for the wayfinders' inability to navigate complex settings. Directional arrows have been found to be especially problematic in such settings. Methods: Ethnographic data were collected and analyzed over a period of 3 years in three overlapping phases. The unique adequacy requirement of methods, which stipulates that the methods used to produce a description of a situation should originate from the situation they describe, was adopted. Results: Directional arrows derive their meaning from the position they occupy within the physical environment and from three sources: the spatial configuration of the setting, the positioning of the sign within the setting, and the directional arrow itself. The affordance closest to the sign will be taken as the one which the sign refers to. Wayfinders treat that affordance as being indicated by the arrow until such time as it becomes apparent that it is not. Conclusions: In response to the need to find lasting solutions to the enduring problems of wayfinding, this article demonstrates how better design of wayfinding systems can be achieved by explicating the indexical properties of directional arrows and their consequences for wayfinding behavior. [ABSTRACT FROM AUTHOR]

A recent trend in public policy in many countries is the requirement for "joined up thinking" and "joined up working", including partnership within and between agencies, and between agencies and their publics. This in turn has led to a growth of interest in action learning as a means to bring about the organizational and individual development required for implementing such policies. Action learning, with its emphasis on solving new problems, implementing solutions and learning-to-learn seems to fit the zeitgeist. However, the notion of "action" in action learning has presented a real difficulty in administering action learning sets in this context. Commencing from a philosophical point of view that emphasises the identity of action and learning, rather than their separation, we report here on three such public sector action learning projects and identify three fundamental features of the action which took place in and around them. Thus: action can occur either inside or outside the set; while it is always an input to the learning process, it can also sometimes be regarded as an output of that process; and finally, the type of knowledge that can be acquired may be in Gilbert Ryle's terms either "knowledge how" or "knowledge that". Five categories of action are identified: expressive action, concerned with feelings and relationships in the set; the enrichment of networks and local knowledge; changes in personal practice; collective action; and organisational change. While organisational change may be regarded as, in one sense, "the big prize" of action learning, it should not blind us to more subtle processes of learning and change that occur.

Lean production (LP) has been increasingly adopted in complex systems, such as healthcare and construction sites. However, little is known of the extent to which the lean philosophy matches the nature of those systems, which have different characteristics of complexity in comparison with manufacturing plants, in which LP was originated. This article analyses the extent to which LP is compatible with the nature of complex systems, as a basis for the identification of learning opportunities for LP from complex systems theory (CST). As a framework for this analysis, both the prescriptions from LP and CST for designing systems are compared in terms of their potential impact on a set of characteristics of complex systems. Examples of how LP may learn from CST are identified as well as examples of how CST may help to tackle common difficulties in LP implementation. [ABSTRACT FROM PUBLISHER]

A network analysis including relative abundances of all ruminal microbial genera (archaea, bacteria, fungi, and protists) and their genes was performed to improve our understanding of how the interactions within the ruminal microbiome affects methane emissions (CH4). Metagenomics and CH4 data were available from 63 bovines of a two-breed rotational cross, offered two basal diets. Co-abundance network analysis revealed 10 clusters of functional niches. The most abundant hydrogenotrophic Methanobacteriales with key microbial genes involved in methanogenesis occupied a different functional niche (i.e., "methanogenesis" cluster) than methylotrophic Methanomassiliicoccales (Candidatus Methanomethylophylus) and acetogens (Blautia). Fungi and protists clustered together and other plant fiber degraders like Fibrobacter occupied a seperate cluster. A Partial Least Squares analysis approach to predict CH4 variation in each cluster showed the methanogenesis cluster had the best prediction ability (57.3%). However, the most important explanatory variables in this cluster were genes involved in complex carbohydrate degradation, metabolism of sugars and amino acids and Candidatus Azobacteroides carrying nitrogen fixation genes, but not methanogenic archaea and their genes. The cluster containing Fibrobacter , isolated from other microorganisms, was positively associated with CH4 and explained 49.8% of its variability, showing fermentative advantages compared to other bacteria and fungi in providing substrates (e.g., formate) for methanogenesis. In other clusters, genes with enhancing effect on CH4 were related to lactate and butyrate (Butyrivibrio and Pseudobutyrivibrio) production and simple amino acids metabolism. In comparison, ruminal genes negatively related to CH4 were involved in carbohydrate degradation via lactate and succinate and synthesis of more complex amino acids by γ-Proteobacteria. When analyzing low- and high-methane emitters data in separate networks, competition between methanogens in the methanogenesis cluster was uncovered by a broader diversity of methanogens involved in the three methanogenesis pathways and larger interactions within and between communities in low compared to high emitters. Generally, our results suggest that differences in CH4 are mainly explained by other microbial communities and their activities rather than being only methanogens-driven. Our study provides insight into the interactions of the rumen microbial communities and their genes by uncovering functional niches affecting CH4, which will benefit the development of efficient CH4 mitigation strategies. [ABSTRACT FROM AUTHOR]

Highlights • Increasing feed efficiency in livestock is seen as a way to improve farm sustainability. • The role of social dominance and activity in efficiency was assessed in beef steers. • Dominance affected feed intake, but did not directly affect efficiency. • A more consistent length of feeding bout was associated with efficiency. • Reducing feeding competition may allow all animals to express full growth potential. Abstract To increase the profitability and sustainability of beef production systems, the use of animals with high feed efficiency is preferred. Efficient animals eat less than their peers for the same or better growth. This efficiency can be measured using feed conversion ratios (FCR) and residual feed intake (RFI) parameters. However, the biological mechanisms, particularly those related to the animal's behaviour and personality, are poorly understood. An individual animal's behaviour, such as its activity levels, may contribute to efficiency. Feed intake is also a factor in efficiency, and therefore, social dominance rank may also indirectly affect efficiency through its influence on feeding behaviour. This experiment investigated the effects of dominance on feeding behaviour, as well as of dominance and activity on average daily gain (ADG), FCR and RFI in two breeds of beef cattle. The study used a 2 × 2 design with 80 cattle of two breed-types (Charolais-cross (CHx) (n = 41) and Luing (n = 39)) and two diets (a concentrate-based diet (CONC) and a mixed forage and concentrate diet (MIXED)). For each individual steer, FCR and RFI were measured over a 56-day performance test. Feed intake, patterns of feeding behaviour, activity and dominance were also measured. Feed intake was affected by dominance, with more dominant steers having significantly higher dry matter intakes (P = 0.001) and feeding rates (P = 0.006) suggesting that dominant animals had priority of access to the feeders. Steers with higher ADG had higher intakes and performed more standing bouts. Steers with better FCR values performed more standing bouts and younger animals had better FCR. For RFI there was also an interaction between breed and variation in length of the feeding events, showing that Luing steers with more consistent feed bout lengths had better RFI, with no association shown for CHx steers. There was no direct effect of dominance on ADG, FCR or RFI. However, the effect of dominance on feed intake suggests that measures of performance in any study may be affected by feeder-space allocation. The associations between standing bouts and feeding bouts with efficiency measures also suggest that individual animal behavioural characteristics influence efficiency and that overall efficiency of all animals may be improved by allowing animals to express individual patterns of behaviour. [ABSTRACT FROM AUTHOR]

Respiration chambers are considered the 'gold standard' technique for measuring in vivo methane (CH4) emissions in live animals. However, the imposed isolation required may alter feeding behaviour and intake, which ultimately impact CH4 emissions. The aim of this study was to assess the impact of isolation within respiration chambers on feed intake and CH4 emissions with two different diets and breeds of beef cattle. In addition, a routine stressor (transport) was used to examine the relationship between individual stress responsiveness and changes in feed intake during isolation. Eighty-four steers (castrated males) (569 ± 5.7 kg bodyweight, BW) were divided into two groups and each group fed with one of two basal diets consisting of (g/kg dry matter, DM) either 50 : 50 (Mixed) or 8 : 92 (Concentrate) forage to concentrate ratios. Within each basal diet there were three supplementation treatments: (1) control, (2) calcium nitrate, and (3) rapeseed cake. The stress biomarkers plasma cortisol, creatine kinase (CK), and free fatty acids (FFA) were determined before (0 h) and after (30 min, 3 h, 6 h and 9 h) a 30-min journey, when steers were transported to the respiration chamber facilities. Methane emissions were measured over a 3-day period using individual respiration chambers. Dry matter intake (DMI) was assessed within the group-housed pens (4 weeks before entry to training pen), in the training pens and the chambers. Cortisol, FFA and CK increased (P < 0.05) after transport confirming a stress response. DMI (g/kg BW) decreased (P < 0.001) during isolation in the training pens (14.7 ± 0.28) and the chambers (14.3 ± 0.26) compared with that of the same animals in the group pens (16.8 ± 0.23). DMI during isolation decreased more in those animals which had an increased (P < 0.05) stress response during transport as measured by cortisol, FFA and CK. With the Mixed diet, the decline in DMI was estimated to result in an increase in CH4 (g/kg DMI) (r = 0.25, P = 0.001), which did not occur with the Concentrate diet. According to the results of this experiment, the stress associated with isolation reduces the DMI resulting in an increase in g CH4/kg DMI in fibrous diets. Habituation to isolation needs refinement in order to reduce the impact of stress on intake and therefore achieve more accurate estimates of CH4 emissions. Alternatively, modelling CH4 estimations according to behavioural and physiological changes associated with isolation stress would improve accuracy of CH4 estimations. [ABSTRACT FROM AUTHOR]

Methane produced by methanogenic archaea in ruminants contributes significantly to anthropogenic greenhouse gas emissions. The host genetic link controlling microbial methane production is unknown and appropriate genetic selection strategies are not developed. We used sire progeny group differences to estimate the host genetic influence on rumen microbial methane production in a factorial experiment consisting of crossbred breed types and diets. Rumen metagenomic profiling was undertaken to investigate links between microbial genes and methane emissions or feed conversion efficiency. Sire progeny groups differed significantly in their methane emissions measured in respiration chambers. Ranking of the sire progeny groups based on methane emissions or relative archaeal abundance was consistent overall and within diet, suggesting that archaeal abundance in ruminal digesta is under host genetic control and can be used to genetically select animals without measuring methane directly. In the metagenomic analysis of rumen contents, we identified 3970 microbial genes of which 20 and 49 genes were significantly associated with methane emissions and feed conversion efficiency respectively. These explained 81% and 86% of the respective variation and were clustered in distinct functional gene networks. Methanogenesis genes (e.g. mcrA and fmdB) were associated with methane emissions, whilst host-microbiome cross talk genes (e.g. TSTA3 and FucI) were associated with feed conversion efficiency. These results strengthen the idea that the host animal controls its own microbiota to a significant extent and open up the implementation of effective breeding strategies using rumen microbial gene abundance as a predictor for difficult-to-measure traits on a large number of hosts. Generally, the results provide a proof of principle to use the relative abundance of microbial genes in the gastrointestinal tract of different species to predict their influence on traits e.g. human metabolism, health and behaviour, as well as to understand the genetic link between host and microbiome. [ABSTRACT FROM AUTHOR]

Ruminal methane production is among the main targets for greenhouse gas (GHG) mitigation for the animal agriculture industry. Many compounds have been evaluated for their efficacy to suppress enteric methane production by ruminal microorganisms. Of these, nitrate as an alternative hydrogen sink has been among the most promising, but it suffers from variability in efficacy for reasons that are not understood. The accumulation of nitrite, which is poisonous when absorbed into the animal's circulation, is also variable and poorly understood. This review identifies large gaps in our knowledge of rumen microbial ecology that handicap the further development and safety of nitrate as a dietary additive. Three main bacterial species have been associated historically with ruminal nitrate reduction, namely Wolinella succinogenes, Veillonella parvula, and Selenomonas ruminantium, but others almost certainly exist in the largely uncultivated ruminal microbiota. Indications are strong that ciliate protozoa can reduce nitrate, but the significance of their role relative to bacteria is not known. The metabolic fate of the reduced nitrate has not been studied in detail. It is important to be sure that nitrate metabolism and efforts to enhance rates of nitrite reduction do not lead to the evolution of the much more potent GHG, nitrous oxide. The relative importance of direct inhibition of archaeal methanogenic enzymes by nitrite or the efficiency of capture of hydrogen by nitrate reduction in lowering methane production is also not known, nor are nitrite effects on other members of the microbiota. How effective would combining mitigation methods be, based on our understanding of the effects of nitrate and nitrite on the microbiome? Answering these fundamental microbiological questions is essential in assessing the potential of dietary nitrate to limit methane emissions from ruminant livestock. [ABSTRACT FROM AUTHOR]

Background: Methane represents 16 % of total anthropogenic greenhouse gas emissions. It has been estimated that ruminant livestock produce ca. 29 % of this methane. As individual animals produce consistently different quantities of methane, understanding the basis for these differences may lead to new opportunities for mitigating ruminal methane emissions. Metagenomics is a powerful new tool for understanding the composition and function of complex microbial communities. Here we have applied metagenomics to the rumen microbial community to identify differences in the microbiota and metagenome that lead to high- and low-methane-emitting cattle phenotypes. Methods: Four pairs of beef cattle were selected for extreme high and low methane emissions from 72 animals, matched for breed (Aberdeen-Angus or Limousin cross) and diet (high or medium concentrate). Community analysis was carried out by qPCR of 16S and 18S rRNA genes and by alignment of Illumina HiSeq reads to the GREENGENES database. Total genomic reads were aligned to the KEGG genes databasefor functional analysis. Results: Deep sequencing produced on average 11.3 Gb per sample. 16S rRNA gene abundances indicated that archaea, predominantly Methanobrevibacter, were 2.5× more numerous (P = 0.026) in high emitters, whereas among bacteria Proteobacteria, predominantly Succinivibrionaceae, were 4-fold less abundant (2.7 vs. 11.2 %; P = 0.002). KEGG analysis revealed that archaeal genes leading directly or indirectly to methane production were 2.7-fold more abundant in high emitters. Genes less abundant in high emitters included acetate kinase, electron transport complex proteins RnfC and RnfD and glucose-6-phosphate isomerase. Sequence data were assembled de novo and over 1.5 million proteins were annotated on the subsequent metagenome scaffolds. Less than half of the predicted genes matched matched a domain within Pfam. Amongst 2774 identified proteins of the 20 KEGG orthologues that correlated with methane emissions, only 16 showed 100 % identity with a publicly available protein sequence. Conclusions: The abundance of archaeal genes in ruminal digesta correlated strongly with differing methane emissions from individual animals, a finding useful for genetic screening purposes. Lower emissions were accompanied by higher Succinovibrionaceae abundance and changes in acetate and hydrogen production leading to less methanogenesis, as similarly postulated for Australian macropods. Large numbers of predicted protein sequences differed between high- and low-methane-emitting cattle. Ninety-nine percent were unknown, indicating a fertile area for future exploitation. [ABSTRACT FROM AUTHOR]

Aim To introduce nurse and healthcare researchers to the ethnomethodological (EM) criteria of the unique adequacy (UA) requirement of methods and to provide guidance on conducting UA research. Background Despite the recent shift in emphasis from quantitative to qualitative methods in nursing research, the practice of EM has been largely overlooked. Data sources Published work in EM. Review methods The paper draws on discussions of UA and related concepts in foundational texts of the discipline, as well as the few examples that exist in nursing research. Discussion EM is a challenging practice to master but when understood and practised properly, it can yield findings that are unavailable to other approaches. UA insists simultaneously on a day-to-day familiarity with the research setting and a principled refusal of explanatory theories that are not native to that setting. Thus, in the UA requirement, EM provides criteria for effectively identifying problems and analysis without recourse to theoretical commitments that might distort or obscure the reality of the research/ setting. Conclusion With regards to the increasing call for more appropriate ways of combating the challenges associated with conducting real-world research, EM provides an effective and alternative method. In EM, nurse researchers can find the potential to develop practical solutions that are sensitive to the setting in which problems occurs. This can underpin the development of an approach to nurse research that is tailored to the principles and practices of the profession. Implications for research/practice Conformance to the UA requirement enables an exclusive focus on workplace issues. UA research provides an account of those issues as they are known and understood to members of the workplace setting. UA directs attention to the detailed analysis of work practices, providing a basis for practical solutions and innovations. [ABSTRACT FROM AUTHOR]

The article discusses the association of stress, ill health or poor nutrition during pregnancy on reduced progeny performance in farm animals. A new research highlights the influence of the prenatal environment on progeny biology from birth to slaughter. Information about prenatal challenges in livestock, studies in cattle and sheep, and possible risks to prenatal development is also discussed.

The aims of the present study were to quantify hydrogen (H2) and methane (CH4) emissions from beef cattle under different dietary conditions and to assess how cattle genotype and rumen microbial community affected these emissions. A total of thirty-six Aberdeen Angus-sired (AAx) and thirty-six Limousin-sired (LIMx) steers were fed two diets with forage:concentrate ratios (DM basis) of either 8:92 (concentrate) or 52:48 (mixed). Each diet was fed to eighteen animals of each genotype. Methane (CH4) and H2 emissions were measured individually in indirect respiration chambers. H2 emissions (mmol/min) varied greatly throughout the day, being highest after feed consumption, and averaged about 0·10 mol H2/mol CH4. Higher H2 emissions (mol/kg DM intake) were recorded in steers fed the mixed diet. Higher CH4 emissions (mol/d and mol/kg DM intake) were recorded in steers fed the mixed diet (P< 0·001); the AAx steers produced more CH4 on a daily basis (mol/d, P< 0·05) but not on a DM intake basis (mol/kg DM intake). Archaea (P= 0·002) and protozoa (P< 0·001) were found to be more abundant and total bacteria (P< 0·001) less abundant (P< 0·001) on feeding the mixed diet. The relative abundance of Clostridium cluster IV was found to be greater (P< 0·001) and that of cluster XIVa (P= 0·025) lower on feeding the mixed diet. The relative abundance of Bacteroides plus Prevotella was greater (P= 0·018) and that of Clostridium cluster IV lower (P= 0·031) in the LIMx steers. There were no significant relationships between H2 emissions and microbial abundance. In conclusion, the rate of H2 production immediately after feeding may lead to transient overloading of methanogenic archaea capacity to use H2, resulting in peaks in H2 emissions from beef cattle. [ABSTRACT FROM PUBLISHER]

Complexity thinking may have both modelling and metaphorical applications in the through-life management of the built environment. These two distinct approaches are examined and compared. In the first instance, some of the sources of complexity in the design, construction and maintenance of the built environment are identified. The metaphorical use of complexity in management thinking and its application in the built environment are briefly examined. This is followed by an exploration of modelling techniques relevant to built environment concerns. Non-linear and complex mathematical techniques such as fuzzy logic, cellular automata and attractors, may be applicable to their analysis. Existing software tools are identified and examples of successful built environment applications of complexity modelling are given. Some issues that arise include the definition of phenomena in a mathematically usable way, the functionality of available software and the possibility of going beyond representational modelling. Further questions arising from the application of complexity thinking are discussed, including the possibilities for confusion that arise from the use of metaphor. The metaphor of a 'commentary machine' is suggested as a possible way forward and it is suggested that an appropriate linguistic analysis can in certain situations reduce perceived complexity. [ABSTRACT FROM AUTHOR]

New approaches to production management can be conceptualized as treating production as flow rather than transformation. These alternatives can in turn be regarded as reflecting opposing ontological positions, holding respectively that reality is constituted of temporal process, or atemporal substance. The new production philosophy thus arguably represents a process ontology radically different from the atemporal metaphysics underlying conventional methods and theories. Moreover, research in physics education has identified the disjunction between ontological categories of 'substance' and 'process' as a particularly acute barrier to understanding process phenomena. Studies are presented which demonstrate the possibility of specifying and classifying mental models, with regard to two important management solutions in construction. Thus, procedures typically adopted in quantity surveying and the implementation of structural engineering design are examined. Methods of measurement used in quantity surveying are designed to account primarily for physical, rather than temporal properties. In design, the emphasis is on representing properties of finished structures, rather than the construction processes. The process is then managed by treating the design and its execution as separate products. It is argued here that alternative, more effective management solutions are derived from a process ontology. [ABSTRACT FROM AUTHOR]

The Unique Adequacy requirement of methods (UA) is proposed as a means of evaluating research in construction management. UA addresses the problems stemming from the significance of conscious action in constituting human organization. These may be summarized as: first, that objectivity is a problematic concept in such studies; second, that the determination of meaning is their primary goal; and third, that formal procedures, whether as methods of research or explanation, have significant limitations. The UA requirement has two forms: the weak form demands that the researcher is competent in the research setting; the strong form, that research reports use only concepts originating within the research setting. The consequences of applying these criteria are explored with reference to recent research reports in construction management, including: a questionnaire survey of cultural difference; an exercise in grounded theorizing; a case study of the implementation of a quality management initiative. It is concluded that the UA requirement is a viable tool for evaluating and guiding research. Emphasis is placed on the importance of maintaining a principled distinction between empirical research and theory building. [ABSTRACT FROM AUTHOR]

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Claims by contractors for additional payments have been identified by commentators as a major source of difficulty in the industry. Ethnographic research with industry members reveals some key features of planning practices that underlie such events. Claims are sometimes planned at tender stage and sometimes during the course of a project. One practice at tender stage is a pricing technique that minimizes the tender price while maximizing the out-turn cost of a contract by exploiting mistakes in the bill of quantities. Another is the programming of work to maximize its vulnerability to delay. More reactive techniques may be employed during the course of the project, often to make up for an unanticipated increase in costs. These and other similar practices may be reported as features of an integrated culture, defined in such a way as to encompass activity and reject Cartesian dualism. The unique adequacy requirements of methods are suitable criteria for the evaluation of such reports. The claims culture arises from economic conditions in the industry, which include low entry barriers and competitive tendering. However, removal of these conditions alone cannot guarantee that the practices will cease. [ABSTRACT FROM AUTHOR]

This paper presents an analysis of a familiar aspect of construction industry culture that we have dubbed 'the claims culture'. This is a culture of contract administration that lays a strong emphasis on the planning and management of claims. The principal elements of the analysis are two sets of distinctions. The first comprises economic and occupational orders, referring to two kinds of control that are exercised over the construct ion process; predicated respectively on economic ownership and occupational competence. The second refers to contrasting attitudes towards relationships and problem solving within these orders: respectively 'distributive' and 'integrative'. The concepts of economic and occupational order entail further sub-categories. The various attitudes associated with these categories and sub-categories are described. They are assessed as to their consequences for change initiatives in the industry. [ABSTRACT FROM AUTHOR]

Some quality managers in the construction industry are attempting to institute total quality (TQ) management. Having established quality assurance (QA) systems, these managers have realized that the benefits to be gained from this bureaucratic approach are limited. They now aim to transform the culture of the industry, making it less adversarial and more customer centred. Using a sociological analysis based on the forms of legitimation of power identified by Max Weber, the institutional situation of quality managers is examined and their consequent ability to introduce innovation is assessed. Weber suggests that there are three forms of authority: traditional, charismatic and rational. These are considered in the light of some modem organization theory and with reference to the particular problem of cultural change. Managers have the best hope of successfully introducing TQ when they can establish a measure of charismatic authority. This is consistent with the centrality given to the concept of leadership by writers on TQ. The practicalities of this are investigated through an account of the process of setting up a quality circle. [ABSTRACT FROM AUTHOR]

In his comment on Seymour, D.E., Crook, D.J. and Rook; J.A. (1997) Construction Management and Economics, 15, 117-19 (Construction Management and Economics, 15, 299-302) argues that positivism provides the best insurance against bad research in construction management studies. He claims that positivist methods of theory building have been modified sufficiently to cope with the demands of management research. He accuses Seymour et al. of being anti-scientific in questioning the viability of these methods. In this short reply, we refute these assertions, pointing out some remaining obstacles to the application of positivist methods to management research. [ABSTRACT FROM AUTHOR]

Culture is increasingly cited as being in need of change if the UK construction industry is to improve its efficiency and productivity. The paper argues that the concept of culture is amenable to radically different treatments and that the research community must recognize the consequences of this choice if it is to make a useful contribution to bringing about the desired change. The dominant research paradigm in construction management is examined and compared to an alternative approach. The consequences attendant upon the choice between these two are explored with reference to four phenomena: a study of quality in the construction industry, Japanese innovation in management, Deming's concept of total quality management and the situation of the site engineer. It is concluded that the dominant rationalist paradigm tacitly endorses existing attitudes and that if researchers are to have a role in changing the culture of the industry, then the culture of research must change also. [ABSTRACT FROM AUTHOR]

We raise a number of questions concerning the theoretical basis of construction management, and enquire into the nature of construction management theory. We highlight the dominant research paradigm in construction management, and call for attention to be paid to alternative research paradigms. We call for a scholarly debate to investigate these issues. [ABSTRACT FROM AUTHOR]