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Usability is fundamentally concerned with how effectively users can interact with a software program. It directly impacts user satisfaction, as a user-friendly interface and intuitive navigation lead to a more enjoyable experience. When usability is prioritized, users can accomplish their tasks more efficiently, which enhances overall productivity.

The focus on usability includes aspects such as the clarity of the user interface, the ease of learning how to use the software, and the ability to perform tasks without unnecessary steps. When these elements are well-designed, users are likely to find the software more acceptable and easier to use, leading to increased satisfaction and efficiency in their workflows.

On the other hand, while hardware compatibility, code transferability, and software modification are important factors in software development, they do not directly relate to how usable a software program is for its end-users. Therefore, the strongest association lies between usability and user satisfaction and efficiency.