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