PDCA
COBIT, a business-focused framework for IT management and governance
Decision cycle, sequence of steps used on a repeated basis
DMAIC (define, measure, analyze, improve and control), an improvement cycle originally from Six Sigma process improvement system
Intelligence cycle, model of military and law enforcement intelligence processing
Lesson study, a teaching improvement process
OODA loop (observe–orient–decide–act loop), feedback loop used ar operational level in combat operations
Robert S. Kaplan (closed loop management system)