Power by itself is useless unless the user feels powerful using the software. It is that feeling that drives the user to want to learn more. For them to get tha

Power by itself is useless unless the user feels powerful using the software. It is that feeling that drives the user to want to learn more. For them to get that feeling, the software has to be usable. It has to permit exploration (i.e, don't punish them for trying stuff) and give good, immediate feedback about what it is doing. The feedback allows them to build a mental model of the program.