Lola Thigh sang and preformed nightly at a venue of Klepacki's major competitor, also a Klepacki (don't confuse these two, the fact that both had the same last name was purely coincidental, and besides, the other one had a different first name - Jacek).
Thigh sang every night in a club.
Using cost models to estimate the cost and length of time necessary to develop a new software system, for example, is appropriate only after requirements have been defined, a system design has been developed, and the size of the new system has been estimated.