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A method for predictably altering behavior without restricting options or significantly changing incentives.

Repeating a set of design, development, and test operations, with each repetition building on the last, until the desired result is achieved.

A continuous expansion or addition of new product features beyond the original scope.

A design process based on consensus building, group decision-making, and extensive iteration.

Things that are aligned are perceived to be more related than things that are not aligned.

As the flexibility of a design increases, the usability of the design decreases.