Quality Attribute Scenarios Start with QA requirement statements Elaborate all quality attribute requirements as scenarios General –system independent Concrete –system specific As simple informal story-like descriptions … Or in a semiformal quality attribute scenario representation: 1. Different system modules should work on different operating system platforms, different databases, and protocol conditions. Finally, for each Quality Attribute refinement, the team documents at least one scenario that illustrates how the quality attribute requirement is being met. Stimulus source 3. Interoperability. There are 6 parts: Source of stimulus (e.g., human, computer system, etc.) Stimulus. ... A quality attribute scenario has six parts, shown in the schematic: Source of Stimulus: the entity generating the stimulus. 2. In the last week, you'll learn to describe your own patterns and tactics and see how they're used in an Android framework. Stimulus 2. b. The truth is that qualities like interoperability, modifiability, ... are short stories that describe an interaction with the system that exercises a particular quality attribute. 4.4 Quality Attribute Scenarios in Practice. quality attributes that are of particular concern to them. Aqualityattributescenarioisaquality-attribute-specificrequirement.Itconsistsofsixparts. Stimulus – a condition that needs to be considered. 1. General scenarios provide a framework for generating a large number of generic, system-independent, quality-attribute-specific scenarios. ... For the above scenario what quality attributes are necessary? It consists of six parts: 1. Artifact – what elements of … • The applications assign paramount importance to quality attributes such as timeliness, reliability, safety, interoperability, etc. QUALITY ATTRIBUTE SCENARIOS A quality attribute scenario is a quality-attribute-specific requirement. Could be an actor, an actuator, a sensor, and so on. Quality Attribute Scenarios. 12 software architecture quality attributes. Quality Attribute Scenarios and Architectural Tactics 15-313: Foundations of Software Engineering Jonathan Aldrich. The problems arise from software, not system engineering practices. Software architecture has a profound affect on most qualities in one way or another and software quality attributes affect architecture. Software quality is the degree to which software possesses a desired combination of attributes (e.g., reliability, interoperability) [IEEE 1061]. Developing systematic ways to relate the software quality attributes of a system to the sys-tem’s architecture provides a sound basis … ... portability and interoperability. A Quality Attribute Scenario is a quality-attribute-specific requirement. The results of this exercise are documented in a utility tree (see Chapter 3 for a detailed discussion of the Quality Attribute utility tree) using the structure that we are now familiar with: Artifact 4. This is some entity (a human, a computer system, or any other actuator) that generated the stimulus. Each is potentially but not necessarily relevant to the system you are concerned with. Environment - what are the conditions when the stimulus occurs? In the third and fourth week, you will learn how to correctly write quality attributes and quality attribute scenarios for a specific case. The quality attributes provide the means for measuring the fitness and suitability of a product. Interoperability of one system to another should be easy for the product to exchange data or services with other systems. Performance – shows the response of the system to performing certain actions for a certain period of time. 9 September 2008 15-313: Foundations of Software Eng ineering Software Architecture 2 Source [BCK03] Bass, Clements, and Kazman. 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