The Congressional Budget Office does solid work. Its nonpartisan findings and estimates can make or break legislation on Capitol Hill.

But economic conditions change, and it's important to keep in mind that when Doug Elmendorf, the CBO's director, testifies before the House Budget Committee, you're hearing estimates, not certain projections.

Here are a few other things to remember:

Another CBO report is in the news — the agency puts out hundreds every year. Here are three things to keep in mind about them. (Jeff Simon/The Washington Post)