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A design flaw is a design that fails to meet requirements or to serve customer needs. A flawed design can result in unstable and unusable products, services and environments. In many cases, they introduce unnecessary risk, damage brand reputation or result in poor product ratings and sales. The following are common types of design flaw.
FunctionalA design that fails to achieve planned functionality. For example, software that allows users to configure it but then ignores configuration settings.A feature, function, behavior, look, feel or flow that results in a poor customer experience such as a device that is always beeping with no easy way to turn beeps off.
UsabilityA user interface that customers find to be clumsy, slow, counterintuitive or useless. For example, software that is crowded with cryptic icons with no clear function or hint as to what each does.FeasibilityA design that can't be built due to constraints that the design fails to consider. This typically results from incorrect assumptions or miscalculation such as an interior design that doesn't actually fit into the available space.
ErrorsA design that fails to handle errors in a reasonable way. For example, unnecessarily halting on minor errors.PerformanceProducts, services, processes, tools and machines that fail to achieve a reasonable level of performance such as a car navigation system with a slow processor and bloated software.A design that fails with respect to sight, sound, touch, taste or smell such as a child's toy with a chemical smell to it.
A design that is difficult for some people to use such as a building that can't be accessed by people with disabilities.RiskA design that introduces needless or unacceptable risks such as a child's toy with needlessly sharp edges.A user interface that is likely to produce human error due to unclear controls or lack of validation. For example, a stock trading app that allows users to enter quantity as price and vice versa.
StructurePoor structure such as a building filled with odd shaped rooms that are difficult to use.OperationalA product, service, process, facility, environment or machine that is unreasonably expensive or dangerous to operate. For example, a building that fails to consider energy loss that is unacceptably expensive to heat and cool.CompatibilityA design that isn't compatible with the real world. For example, electronics that place connection ports too close together that don't work with the width and shape of many cords available on the market.
ReliabilityA product, service, infrastructure component or machine that experiences excessive downtime due to design issues. For example, a network device that is prone to overheating and crashing due to a power saving design that often turns off cooling features.
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