Any process that does not have provisions for its own refinement will eventually fail or be abandoned
– W. R. Corcoran, PhD, P.E., The Phoenix Handbook: The Ultimate Event Evaluation Manual for Finding Profit Improvement in Adverse Events, Nuclear Safety Review Concepts, 19 October 1997.
Improving any process has a few requirements
1) a baseline defining what is actually being done
2) a baseline of process performance
3) a performance target
4) a mechanism to change the process in a controlled way
It helps to have a model and some detailed, step by step data.
You can only know if you have improved when you know not only what changed but also how much the outcomes changed. Sometimes change is big, but most improvement comes from a series of small improvements.