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The six signals of quality in software

Reliability

Does the software technically perform as expected, all of the time? This means no bugs, no downtime, no errors, and so on.

Speed

Does the software react to input instantly, or as near as practically possible? For those tasks that must take longer, are they as fast as possible?

Clarity

Does the person using the software understand everything?

Efficacy

Can the person do what they need to do with the software?

Efficiency

Can the person do what they need to do with the software as easily as possible?

Beauty

Is the software as aesthetically pleasing as possible?