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