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Qualities of a software: functioality reliability usability efficiency maintainability portability Functionality: Capabilities of the software/Requirment after implementation are called its functionality. Reliability: functionality is there but the accuracy is not there. Usability: The user friendliness of a software is called its usability. Efficiency: The capability to provide accurate answer. If the software is giving it full performance within its assigned resources is called its efficiency. Maintainability: The software should be feature compatible. Portability: The software should be platform compatible.