How to determine if a company decision was successful or not?
You could use time series approach to model the "what if not" scenario and compare it with your values after the new program introduction. Check the causal_impact packet from Google and you might also find helpful this tutorial for probabilistic programming. http://nbviewer.jupyter.org/github/CamDavidsonPilon/Probabilistic-Programming-and-Bayesian-Methods-for-Hackers/blob/master/Prologue/Prologue.ipynb