TELOS CORP

Backlog is also a useful measure in developing our annual budgeted revenue by estimating for the upcoming year our continuing business from existing customers and active contracts. We consider backlog, both funded and unfunded (as explained below), other expected annual renewals, and expansion planned by our current customers.

Total backlog consists of the aggregate contract revenues remaining to be earned by us at a given time over the life of our contracts, whether funded or unfunded. Funded backlog consists of the aggregate contract revenues remaining to be earned at a given time, which, in the case of U.S. government contracts, means that they have been funded by the procuring agency. Unfunded backlog is the difference between total backlog and funded backlog and includes potential revenues that may be earned if customers exercise delivery orders and/or renewal options to continue these contracts.

Based on historical experience, we generally assume option year renewals to be exercised. Most of our customers fund contracts on the basis of one year or less, and, as a result, funded backlog is generally expected to be earned within one year from any point in time, whereas unfunded backlog is expected to be earned over a longer period.

Increases in backlog is a result of the award of new contracts and the renewal or extension of existing contracts. Reductions in backlog arise from the completion or the early termination of contracts. See the relevant industry, legal and regulatory risks under Item 1A,"Risk Factors," of this 10-K. We believe that comparisons of backlog period-to-period are difficult. We also believe that it is difficult to predict future revenue solely based on analysis of backlog. The actual timing of revenue from projects included in backlog will vary.