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In software and systems engineering, a use case is a potential scenario in which a system receives an external request (such as user input) and responds to it. A use case is a list of actions or event steps typically defining the interactions between a role (known in the Unified Modeling Language (UML) as an actor) and a system to achieve a goal.
Happy day (or sunny day) scenario and golden path are slang synonyms for happy path. [6] In use case analysis, there is only one happy path, but there may be any number of additional alternate path scenarios which are all valid optional outcomes.
A number of criticisms have been leveled against the use of worst-case scenarios. [1] In some cases, a conceivable worst-case scenario within a field may be so far beyond the capacity of participants to deal with that it is not worth the effort to develop or explore such a scenario; where this is possible, it is "important to evaluate whether the development of a worst-case scenario is ...
The Los Angeles-area fires are a worst-case scenario caused by powerful winds that struck after months without rain. Fire experts, past reports and risk assessments had all anticipated a wildfire ...
The terms are used in other contexts; for example the worst- and best-case outcome of an epidemic, worst-case temperature to which an electronic circuit element is exposed, etc. Where components of specified tolerance are used, devices must be designed to work properly with the worst-case combination of tolerances and external conditions.
The term "corner case" comes about by physical analogy with "edge case" as an extension of the "flight envelope" metaphor to a set of testing conditions whose boundaries are determined by the 2 n combinations of extreme (minimum and maximum) values for the number n of variables being tested, i.e., the total parameter space for those variables.
On Monday, the North Carolina State Climate Office provided a picture of how the "monster storm" was nearly a "worst-case scenario for western North Carolina."
A worst-case circuit analysis should be performed on all circuitry that is safety and financially critical. Worst-case circuit analysis is an analysis technique which, by accounting for component variability, determines the circuit performance under a worst-case scenario (under extreme environmental or operating conditions).