Requirement changes on cost plus contracts are endemic. And it's not one way - typically the pipeline is starting to work on the project with requirement A unde

Requirement changes on cost plus contracts are endemic. And it's not one way - typically the pipeline is starting to work on the project with requirement A under the assumption it will cost X, find out a decent way through that it's going to cost way more than X, then change to requirements B under the assumption it will only cost Y, repeat two or three times.