You should change your test plan format every few releases.
Let's step back and think about this for a minute.
Over time, we stop finding issues with the test plan we're using. We're wearing the same old pathways through the system.
We need a way to shake things up. Regression tests are great, but there are always new things to find. Looking at things the same way encourages us to think about them the same way.
Consequently, we change our test plan format every couple of releases. It's the same stuff, just formatted differently. The theory is that looking in a new way at the same tests helps us see the whole system differently.
The downside to this, of course, is that it makes it a lot harder to compare results across releases.
Anyone else trying anything like this? How's it working for you?