Craeg StrongCTO| Savant Financial Technologies IncNew York, Ny, United States
It depends on the maturity and size of the team, but generally these days I use "right sizing" aka #NoEstimates. We split stories to be small enough so that nothing is over a week.
BTW I highly recommend "When will it be done,"/Vacanti "No Estimates: how to measure project progress without estimating,"/Duarte and "Software Estimation without guessing"/Dinwiddie. Saving Changes...