An edge case is a situation that rarely occurs but can occur. Despite their rarity, they are an important consideration in design as they often must be handled to achieve a reasonable level of quality. The following are common types of edge case.A function or feature that a customer needs. Firms may seek to minimize functionality to those things that are common needs amongst a target market. Alternatively, they may seek to add as many functions as possible by exploring edge cases with lead users.The customer experience preferences of individuals. It is common for designs to allow users to customize things to their preferences. Edge cases can be handled with self-service tools or personalized service that completely bend to the customer.
Differing human abilities such as language or physical abilities. In the past, firms often designed for the mythical average person resulting in designs that excluded a large number of people. A better approach is to design to the edges to include as many people as possible.
ConditionsReal world conditions such as the weather faced by an aircraft. In order for a design to be considered robust and stable it typically must handle all real world conditions that are reasonable possible.
ParametersThe range of parameters that could be submitted to a technology as user input or through a technical interface such as an API. Secure and stable designs assume that input may be of a malicious nature.
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