Yes|No is a simple app.
If you are unsure of anything just think of it and check if it is yes or no.........

Think of what you want to do while pressing the center key in app and release when you are done and see if it is Yes or No...

I know it doesn't have any logic but if yes comes you get some confidence in that and if No comes you can say this all is wrong and still go for it......

Try it.......it is real fun!