Sometimes the endorsement consists of a simple exchange of letters and too often the focus is on solving the immediate problem, rather than ensuring that the rest of the project runs smoothly. For example, problems may arise through time extensions, variations, or additional work. There is a risk that the extent or impact of the endorsement will not be clear in the event of a delay or waiver. One of the consequences of economic turbulence is that many contracts and transactions are renegotiated in whole or in part. . . .