This example allows users to return to any point in the sequence without losing their progress.

University of Michigan - Ann Arbor

Users often have unstructured goals in a complex software. As such, they don't often follow a linear task flow, as they need to analyze and adapt their goals over time. Designers should support this by avoiding designs that force users to complete a task from start to finish with no way to exit.  

"For example, provide methods that allow for skipping ahead, looping back to an earlier step, and moving fluidly from any step to any other."

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