Section 8.1 states, “Critical weighing, measuring, or subdividing operations should be witnessed
or subjected to an equivalent control. Other critical activities should be witnessed or subjected to
an equivalent control.”. Due to the nature of API manufacturing, when you’re charging liquids or
solids, usually a printout out from a flow meter or weight-cell would suffice as an indicator that you
charged the appropriate amount of reagent, or catalyst, etc. Alternate means may also be
appropriate.