This is the first of the so-called maintenance steps. Once we've worked 1 through 9 our recovery should be on firm footing and we can truly begin getting on with life free of our addiction and truly empowered. But lasting and empowering recovery requires ongoing growth, and the 10th Step is one of the best ways to ensure we continue to develop. Step 10 gives us a framework for the continuing, but not obsessive, self-evaluation that leads to serenity and balance or gives us a way to get back to it when things go wrong. Tenth Step inventory can be done almost any way you want to do it.
Some people actually sit down and write a bit every evening.
I find it works better for me first thing in the morning along with organizing my day. But there are times when I don't do that either. I have discovered I can keep track by noticing my mood and what I'm actually doing some call this maintaining a witness within. When I realize I'm angry or sad or whatever, I mentally check to see what's going on. I'll realize I've allowed some resentment to build.