What is the Q7A definition for deviations? For example, if one forgets to sign and date a step, but the same person goes back at a later time and signs and dates the step, does a deviation need to be written?

In the glossary, deviation is defined as the departure from an approved instruction or established
standard. Any deviation from established procedures should be documented and explained.
Critical deviations should be investigated, and the investigation and its conclusions should be
documented. Q7A allows the company to determine the extent of the investigation or explanation.
This allows for simple deviations like transposing numbers to be easily corrected and noted.
Similarly, if you forget to sign and date a step, you would write directly on that sheet later that the
step was completed and the line was not filled out at the time.