Edit: Changed the parameter for myself to 1 minute - there's no reason to need 2 I realize. Everyone will be different but I know myself and even when still half asleep this can be done is already being done easily. This is based on the Buddhist concept that is pretty much what is responsible for creating karma, and basically we are working with the mind before it turns into action. (for more info check the Wikipedia article here) I suppose we can call it the Cetana Checking Challenge too if we use the Pali word. To be clear you don't need to be Buddhist, it's about psychology and motivation. Other than the usual streak length I think another parameter would need to be a small window where you have the opportunity to remember to check in and be honest about your intentions, for example if you are using something as pSub. For me I think 2 minutes, any longer than that I feel my mind may have gone down a slippery slope. Other people may want a different parameter to get started, though I actually debated 3 minutes being too long. Of course this is subjective and you wouldn't have a stopwatch ready but it is a guideline. So the rule is, if you realize you've let it go longer than the self determined window and basically was not honest with yourself about your intention and/or didn't remember to check then you reset. The point is to develop a habit of checking your intentions. I think it would be helpful to state to yourself "my intention for doing this is _____" BEFORE you take physical action, whether that's tapping on the screen to view something or looking at that girl. Notice you can end up doing it, but it is a matter of being aware of your intention and being honest about it. I trust that once it is in mind people will be far more likely to "do the right thing" - or don't as the case may be. Since we are interested in rebooting it is also just as far as PMO is concerned, I don't expect people to do that with every single thought they have. But remember we have that tendency toward self deception, that window of time is the opportunity to come back, just like you would come back to the breath in formal meditation. Coming back to honesty with yourself.