At certain points during project work, errors are being made. What is true for them?

a) Over time, it gets cheaper to fi x an error; it is therefore best to delay error fi xing until it gets unavoidable.

b) The cost and diffi culty to fi x an error grows with the local, temporal, and organizational distance from its origin.

c) It is generally cheaper to let the error be fi xed by another contractor than the one who made it.

d) One can always convince a customer that the error is a valuable feature, and it will then not have to be fi xed.