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A system that will have major and dire repercussions in the event of a failure or malfunction is considered a critical system. Therefore, Software developers usually apply strict standards, testing, and regulatory compliance while developing, operating, and maintaining critical systems to ensure their reliability, security, and resilience due to the high risks involved. Software developers and large organizations try to apply the best methodologies to develop critical systems. The PMBOK framework and Agile methodologies have gained wide acceptance by software developers. These frameworks became more popular because they applied best practices and made them suitable for working in the management of critical systems development processes. The main objective of the research is to review the characteristics associated with the failure of critical systems and analyze how to reduce the failure of critical systems through the use of appropriate software development frameworks. This is done through a literature review, where published studies and research on the failure of critical systems and their critical characteristics will be reviewed. Along with emphasizing Agile Software Development Methods (ASDM) like Scrum, LeSS, and SAFe, this analysis also contrasts them with PMBOK’s best project management practices and recommendations. [ABSTRACT FROM AUTHOR]

The practices of lean and agile methods are important to manage and guide projects development in different situations. However, selecting the appropriate practices of lean and agile methods is a daunting task, owing to the availability of hundreds of practices. This wide variety of available practices bewilders potential users, in terms of the best practices that may yield satisfactory solution when applied to the project development. Lean and agile practices selection model is necessary to guide both academic and industrial experts to choose the appropriate practices for a specific project development. Thus, this study aimed to develop lean and agile practices selection (LAPS) model that presents a clear picture of how developers can use LAPS model to select and adopt different practices from various lean and agile methods. Qualitative research method (e.g., grounded theory) was used to interview 18 software developers across 13 countries. The validated qualitative analysis results showed that the proposed LAPS model consists of two main components, which are (1) lean and agile practices that include 41 best practices related to lean and agile methods and (2) factors that affect the process of lean and agile practices selection including five main factors and 17 subfactors associated with the five main factors. The two case studies conducted assured the validity and applicability of the lean and agile practices selection model. [ABSTRACT FROM AUTHOR]

One of the main obstacles in software development projects is requirement volatility (RV), which is defined as uncertainty or changes in software requirements during the development process. Therefore, this research tries to understand the underlying factors behind the RV and the best practices to reduce it. The methodology used for this research is based upon qualitative research using interviews with 12 participants with experience in agile software development projects. The participants hailed from Austria, Nigeria, the USA, the Philippines, Armenia, Sri Lanka, Germany, Egypt, Canada, and Turkey and held roles such as project managers, software developers, Scrum Masters, testers, business analysts, and product owners. Our findings based on our empirical data revealed six primary factors that cause RV and three main agile practices that help to mitigate it. Theoretically, this study contributes to the body of knowledge relating to RV management. Practically, this research is expected to aid software development teams in comprehending the reasons behind RV and the best practices to effectively minimize it. [ABSTRACT FROM AUTHOR]

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