If a profession is to sharpen its skills, to develop new skills and applications, and to gain increasing respect and credibility, then theory and practice must be closely related – Martin Shrub
Process and Practices without Principles are of little use outside anecdotal experiences. This is the case in many situations when ideas are put forward in the absence of principles on which those ideas must be based so they can be tested for credibility, applicability, verifiability and validation that they are useful for the situation at hand.