Validity checks
The validity of an Action research inquiry is enhanced by keeping the proposition, action and review phases of the inquiry distinct, being so far as possible scrupulous in completing each of them before moving on to the next.
It is very important that each phase should have its full value, so that actions are not undermined or contaminated by premature reviewing; that reviewing is comprehensive and not diminished by premature closure; and that the proposition phase is not undermined by out of place reviewing.
In addition to this, an inquiry's validity is deepened to the extent to which each participant holds responsibility for a series of validity checks, confronting questions about the inquiry process. Here are a series of questions that I have found to be very effective.