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Record Performance Requirements and Goals
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The preferred method for recording goals and requirements will necessarily be particular to your team and tools. However your team manages requirements and goals, you must remember to record both the quantitative and the qualitative versions of the goals and requirements together. By doing so, when it is late in the project and someone tries to decide if the application is performing well enough to be released, you can quickly refer not just to the numbers, but to the intent behind the numbers to help you and your team make a more informed decision.
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Quantifying response-time goals is tightly related to expressing the user s perception of the application s performance. Most often, users of your application are not able to articulate how long it should take to display data onscreen, what the application throughput should be, or how many transactions per second a database must support. However, users do notice the performance behavior of the application, based on their impressions, which are the result of several factors: previous experience, the criticality of the task, and how their expectations have been set.
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11 Consolidating Various Types of Performance Acceptance Criteria Objectives
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Learn how to identify and capture performance requirements and testing objectives based on the perspectives of system users, business owners of the system, and the project team, in addition to compliance expectations and technological considerations. Learn how to consolidate this information into a single set of verifiable, complementary performance acceptance criteria. Learn how to review and update the performance acceptance criteria throughout the project as more information becomes available.
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Performance requirements and testing objectives are typically derived from five sources: the perspectives of the system users, business owners of the system, and the project team, as well as compliance expectations and technological considerations. This chapter demonstrates how to blend and consolidate the information collected from these sources into a single set of verifiable, complementary performance requirements and testing objectives. Determining the desired performance characteristics for a system from particular perspectives is only the first part of determining the overall performance acceptance criteria for that system. After examining the desired performance characteristics from limited perspectives, you must resolve those characteristics against one another. For example, end users may desire sub-second response time for every transaction; business stakeholders may want the system to support millions of users; and compliance criteria may mandate strict security policies. Individually, any of these characteristics may be achievable, but collectively they may not be possible due to time, technology, and/or budget constraints. Finding a way to achieve these desired characteristics presents team-wide challenges that should be addressed proactively, not reactively after conflicts become apparent through testing.
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Use this chapter to understand how to consolidate various types of performance acceptance criteria based on the perspectives of system users, business owners of the system, and the project team, and on compliance expectations and the technologies involved. To get the most from this chapter: Use the Terminology section to understand common terms used in relation to performance-testing requirements and acceptance criteria that will facilitate articulating terms correctly in the context of your project.
Use the Approach for Consolidating Acceptance Criteria section to get an overview of the approach to determining performance testing acceptance criteria, and as quick reference guide for you and your team. Use the various activity sections to understand the details of consolidating acceptance criteria based on the perspectives of system users, business owners of the system, and the project team, and on compliance expectations and technological considerations.
Terminology
The following terms and definitions help to distinguish between the various types of performance characteristics. Term / Concept Performance requirements Description Performance requirements are those criteria that are absolutely non-negotiable due to contractual obligations, service level agreements (SLAs), or fixed business needs. Any performance criterion that will not unquestionably lead to a decision to delay a release until the criterion passes is not absolutely required and therefore, not a requirement. Performance goals are the criteria that your team wants to meet before product release, although these criteria may be negotiable under certain circumstances. For example, if a response time goal of three seconds is set for a particular transaction but the actual response time is 3.3 seconds, it is likely that the stakeholders will choose to release the application and defer performance tuning of that transaction for a future release. Performance thresholds are the maximum acceptable values for the metrics identified for your project, usually specified in terms of response time, throughput (transactions per second), and resource-utilization levels. Resource-utilization levels include the amount of processor capacity, memory, disk I/O, and network I/O that your application consumes. Performance thresholds typically equate to requirements. Performance targets are the desired values for the metrics identified for your project under a particular set of conditions, usually specified in terms of response time, throughput, and resource-utilization levels. Resource-utilization levels include the amount of processor capacity, memory, disk I/O, and network I/O that your application consumes. Performance targets typically equate to project goals. Performance testing objectives refer to data collected through the performance-testing process that is anticipated to have value
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