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The study of contemporary requirements engineering (RE) methodologies indicates that modelling of organisational goals constitutes a central activity of the RE process. In particular, goals provide the rationale and drive the elaboration of the requirements that operationalise them. They also provide the criteria against which the completeness and correctness of the requirements specification is validated. In other words, requirements implement goals in the same way that programs implement design specifications. Despite the significance of goals in RE, research in the field is fragmented. No research has so far taken place in order to define the overall role that goals play in RE. This paper puts forward a unifying view of goal analysis in the context of RE. This allows the identification of similarities and differences between the different conceptions of goal used by different approaches and promotes the understanding of the overall role of goal analysis in RE. Based on this understanding the various approaches can be put together, thus leading to a stronger goal-driven RE framework that takes advantage of the contributions from the many streams of goaloriented research.

A critical factor in successful requirements analysis appears to be the understanding not only of what the system under consideration should do, but also why. To capture the purpose of an information system, one needs a mechanism to describe the behaviour of the organization in which the system will operate. This approach suggests further understanding and modelling of the organizational goals and the way that these goals become operationalised. In software systems development we often make the distinction between the enter prise world and the system world. The former describes the domain about which the proposed software system is to provide some service, while the second is concerned with specifications on what the system does and include descriptions of the systems requirements, conceptual designs and implementations. This paper describes an approach which involves the explicit modelling of organizational objectives, social roles and operations and the synthesis of these different perspectives towards a set of information systems requirements.

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Abstract.One of the most important areas in the developing field of cloud computing is the way that investigators conduct researches in order to reveal the ways that a digital crime took place over the cloud. This area is known as cloud forensics. While great research on digital forensics has been carried out, the current digital forensic models and frameworks used to conduct a digital investigation don't meet the requirements and standards demanded in cloud forensics due to the nature and characteristics of cloud computing. In parallel, issues and challenges faced in traditional forensics are different to the ones of cloud forensics. This paper addresses the issues of the cloud forensics challenges identified from review conducted in the respective area and moves to a new model assigning the aforementioned challenges to stages.