The discipline of process improvement (PI) is supported by different methodologies and many useful tools today. You may have heard of Lean for targeting waste, Six Sigma for its focus on minimizing variation, the PDCA cycle, Total Quality Management (TQM), and other schools of thought concerning PI. A tool increasingly used in PI and which you should be familiar with is the A3, regardless of the methodology employed.
Mistake-proofing, or poka-yoke in Japanese, means making sure that a specific task, or series of tasks, occurs without a hitch all the time. It fits well within the key Lean idea of avoiding waste. Indeed, why spend precious time discussing errors and trying to correct them? Is there not a better way?