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SoftwareÂ¿s ability to adapt is typically performed at two different stages: modifiability during development, and adaptation during execution. The first type of adaptation is concerned with design-time, or compile-time, techniques that permit the modification of the structure and function of a software representation in order to address changing stakeholder requirements. The second type of adaptation occurs at run-time during the execution of the program. This type of adaptation refers to a systemÂ¿s ability to modify itself and to respond to changing conditions in its external environment.