Azadeh Alebrahim

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For accepting clouds and using cloud services by companies, security plays a decisive role. For cloud providers, one way to obtain customers' confidence is to establish security mechanisms when using clouds. The ISO 27001 standard provides general concepts for establishing information security in an organization. Risk analysis is an essential part in the(More)
We present a model- and pattern-based method that allows software engineers to take quality requirements into account right from the beginning of the software development process. The method comprises requirements analysis as well as the derivation of a software architecture from requirements documents, in which quality requirements are reflected(More)
Design decisions should take quality characteristics into account. To support such decisions, we capture various solution artifacts with different levels of satisfying quality requirements as variabilities in the solution space and provide them with rationales for selecting suitable variants. We present a UML-based approach to modeling variability in the(More)
Affecting multiple parts in software systems, security requirements often tangle with functional requirements. In order to separate crosscutting concerns and increase modularity, we propose to represent security requirements as aspects that can be woven into functional requirements. Using problem frames to model the functional requirements, weaving is(More)
We propose in this paper an iterative method composed of three steps to derive architecture alternatives from quality requirements using a catalogue of patterns and styles. The solution candidates are chosen by answering a set of questions which reflects the requirements. We instantiate then the solution candidates using a UMLbased enhancement of the(More)
Quality requirements, like security requirements, are difficult to elicit, especially if they cross multiple domains. Understanding these domains is an important issue in the requirements engineering process for the corresponding systems. Well-known requirements engineering approaches, such as goal-oriented techniques provide a good starting point in(More)
Many problems might arise when performance requirements are not taken into account from the beginning of software development. Architectural solutions such as performance patterns represent design decisions on the architecture level that might constrain quality requirements significantly. Knowledge which is gained in the solution space, for example from(More)