Juran refers to the continuity of the PDCA 'cycle' in his handbook (pg. 4.8), taken from Deming's 'Out of the Crisis' (pg. 88). Juran also depicts it - I think in 'Quality Planning and Analysis - as a spiral.
I've found that every 'problem solving' process invented follows this repeating spiral no matter whether it is called PDCA, PDSA, DMAIC,
8D, or whatever.
I don't ANTICIPATE anybody disagreeing with this.... RATS!