This excerpt taken from the WG 10-Q filed Nov 1, 2007.
Our backlog is subject to unexpected adjustments and cancellations and is, therefore, an uncertain indicator of our future earnings.
We cannot guarantee that the revenue projected in our backlog will be realized or profitable. Projects may remain in our backlog for an extended period of time. In addition, project cancellations or scope adjustments may occur, from time to time, with respect to contracts reflected in our backlog and could reduce the dollar amount of our backlog and the revenue and profits that we actually earn. Many of our contracts have termination for convenience provisions in them in some cases, without any provision for penalties or lost profits. Therefore, project terminations, suspensions or scope adjustments may occur from time to time with respect to contracts in our backlog. Finally, poor project or contract performance could also impact our backlog and profits.