Nick Winter and Seth Roberts have written extensively about a system they call percentile feedback. Each day, they log the many times they start and stop tasks that they categorize as productive or unproductive. At a given moment, they can make statments like “I’ve done more work since I woke up than I have done by this point in 70 percent of days.”

The two most important things in arbtt are making sure you’re always logging and making sure you’re capturing the right information. Before you spend hours on your categorize.cfg, make arbtt start automatically and get your window titles right. You’ve got the activity logs so can worry about categorizing later.