> In general a series of positive integers might start counting from 0 or from 1 there is no way to know up front.<p>No. Positive means precisely greater than zero.<p>> Tight coupling is good.<p>No. It depends, usually because decoupling has <i>cost</i>.<p>> By spending 50% of your time NOT writing prod code (but tests instead) you can INCREASE your velocity.<p>...as well as decrease the velocity for all the rest of your team by stiffling
the architecture with tests. Depends on what and how is written.