I've gotten tremendous gains out of breaking actions that are easy to fail into multiple steps so I know exactly where things worked or didn't.
The one I've written about before is in regards to healthy eating. I split "Eat Healthy" on my Lights Spreadsheet into two things I try to do in a day:
1. Eat Healthy -- Plan
2. Eat Healthy -- Execute
In my experience, there's a tremendous difference between eating junk food as a result of no plan to eat healthy vs. a failure of execution and followthrough when you have a plan.
The vast majority of the times I've eaten poorly, it's been a result of not having a plan for where to get easy, fast, convenient good food. Transit days, the restaurant is closed, there's nothing in the refrigerator, or whatever else.
When I know exactly where good food is going to come from, it's very easy to follow through on.
But if I was only tracking if I ate healthy or not and say "No" for three days in a row, is it because of a lack of will or because of a lack of good options around?
Most people subscribe to the "Try harder!" approach to life. When they fail, instead of analyzing, they just say, "I need to try harder!"
This usually doesn't work by itself. Much better to dig into root causes. If I arrive in London and don't know the neighborhood I'm staying and eat kind of junky food for a few days, the way to fix that isn't try harder but to rather identify a mix of grocery stores and healthy restaurants nearby.
This applies as well for making progress on a big project, such as:
1. Major Achievement Defined
2. Major Achievement Completed
There's a large difference between not knowing the next step and failures that stem from that (confusion) as opposed to breakdowns of will or followthrough.
If there's something you're having a hard time sticking with, try breaking it up so you can see where things go off the rails. It takes very little effort and great increases success rates.