When executing a task let it be either specific like commissioning, installation, troubleshooting etc or daily routine task in your workplace, you are prone to mess with it. Below diagram illustrates how you should react when you are doing your job.
Normally this is actually our guideline but we never realize it until you see this. Thinking back for the last 9 years of my career I actually did exactly as describes in the diagram above.
It was taken from the world's no 1 oildfield service company.