The term "Contract Coverage" refers to how the contract dates and feature dates overlap. See diagrams below for the types of contract coverage and what they mean.
A contract is present for the full length of the Feature. They may have the same start and end dates, or the contract may be longer than the Feature. This is the closest thing to the current flash model in Good Central.
Contract coverage and feature period are out of sync. The feature can start or end before or after the contract does.
There is no contract overlapping with the feature.