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High Quality Content by WIKIPEDIA articles! The worst-case execution time (WCET) of a computational task is the maximum length of time the task could take to execute on a specific hardware platform. Knowing worst-case execution times is of prime importance for the schedulability analysis of hard real-time systems.At the higher level, the overall system performance is analyzed, given the results of the WCET analysis for each task or program in the system. Multiple tasks are usually assumed to execute on a single processor and compete for resources, and thus possibly block while attempting to access the resources. The most common type of analysis here is schedulability analysis: for example, fixed-priority analysis or rate-monotonic scheduling analysis. The tightness, or precision of schedulability analysis relies on the accuracy of the WCET analysis. If the WCET values are pessimistic (greater than any execution time that can occur in a running system) then the scheduler will be forced to allocate more time to those tasks than actually required.