How to measure retention?
I would always believe that doing business is a mix of talent, intuition, luck and of course knowledge. As the first three either you have or not, the last one is a matter of time and hard work. Know-how comes with experience you gain over the time, with training, workshops and analysis. You may like it or not but without hard data you cannot manage and grow your business. You have probably learned tough lesson that some numbers may say two different things depending on how you read them. This may lead to completely contradicting conclusions and can seriously affect your business strategy.