what you do your ability to do it and the degree of difficulty involved in replacing you maybe you want to write the formula down in both of its forms and think about it until it's as much a part of you as your name the reason it isn't spelled out on your checklist is because you might not want everyone to know what you're up to the checklist is valuable only to a person who knows what the words really indicate all right you've got the formula as you think about it its meaning will become clearer to you with