Joesgoals allows you to have negative goals (i.e. things you don’t want to do) as well as positive goals. The chain then refers to the number of days you have refrained from doing the undesired behaviour (like smoking, eating chocolate cake, etc.). I put my Will Do list in as a negative goal - Not Complete Will Do List - so that the program shows up immediately if I’ve not completed the list for three days. I get a row of three red crosses!
Never underestimate the power of these types of visual reminders. I regard getting even one cross as a major disaster, and would do almost anything to avoid three in a row. Yes, I might even exercise discrimination in what I put on the list in the first place!