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10_quality_requirements.html
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<!DOCTYPE html>
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<title>Quality Requirements</title>
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<h2 id="section-quality-scenarios">Quality Requirements</h2>
<div class="sectionbody">
<div class="sidebarblock arc42help">
<div class="content">
<div class="paragraph">
<div class="title">Content</div>
<p>This section contains all quality requirements as quality tree with scenarios. The most important ones have already been described in section 1.2. (quality goals)</p>
</div>
<div class="paragraph">
<p>Here you can also capture quality requirements with lesser priority,
which will not create high risks when they are not fully achieved.</p>
</div>
<div class="paragraph">
<div class="title">Motivation</div>
<p>Since quality requirements will have a lot of influence on architectural
decisions you should know for every stakeholder what is really important to them,
concrete and measurable.</p>
</div>
<div class="paragraph">
<div class="title">Further Information</div>
<p>See <a href="https://docs.arc42.org/section-10/">Quality Requirements</a> in the arc42 documentation.</p>
</div>
</div>
</div>
<div class="sect2">
<h3 id="_quality_tree">Quality Tree</h3>
<div class="sidebarblock arc42help">
<div class="content">
<div class="paragraph">
<div class="title">Content</div>
<p>The quality tree (as defined in ATAM – Architecture Tradeoff Analysis Method) with quality/evaluation scenarios as leafs.</p>
</div>
<div class="paragraph">
<div class="title">Motivation</div>
<p>The tree structure with priorities provides an overview for a sometimes large number of quality requirements.</p>
</div>
<div class="paragraph">
<div class="title">Form</div>
<p>The quality tree is a high-level overview of the quality goals and requirements:</p>
</div>
<div class="ulist">
<ul>
<li>
<p>tree-like refinement of the term "quality". Use "quality" or "usefulness" as a root</p>
</li>
<li>
<p>a mind map with quality categories as main branches</p>
</li>
</ul>
</div>
<div class="paragraph">
<p>In any case the tree should include links to the scenarios of the following section.</p>
</div>
</div>
</div>
</div>
<div class="sect2">
<h3 id="_quality_scenarios">Quality Scenarios</h3>
<div class="sidebarblock arc42help">
<div class="content">
<div class="paragraph">
<div class="title">Contents</div>
<p>Concretization of (sometimes vague or implicit) quality requirements using (quality) scenarios.</p>
</div>
<div class="paragraph">
<p>These scenarios describe what should happen when a stimulus arrives at the system.</p>
</div>
<div class="paragraph">
<p>For architects, two kinds of scenarios are important:</p>
</div>
<div class="ulist">
<ul>
<li>
<p>Usage scenarios (also called application scenarios or use case scenarios) describe the system’s runtime reaction to a certain stimulus. This also includes scenarios that describe the system’s efficiency or performance. Example: The system reacts to a user’s request within one second.</p>
</li>
<li>
<p>Change scenarios describe a modification of the system or of its immediate environment. Example: Additional functionality is implemented or requirements for a quality attribute change.</p>
</li>
</ul>
</div>
<div class="paragraph">
<div class="title">Motivation</div>
<p>Scenarios make quality requirements concrete and allow to
more easily measure or decide whether they are fulfilled.</p>
</div>
<div class="paragraph">
<p>Especially when you want to assess your architecture using methods like
ATAM you need to describe your quality goals (from section 1.2)
more precisely down to a level of scenarios that can be discussed and evaluated.</p>
</div>
<div class="paragraph">
<div class="title">Form</div>
<p>Tabular or free form text.</p>
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