Checklist for the Confused

Did you make a program and download it to your NXT only to find that it didn't turn out as planned? This checklist is for you!:

Perhaps an error in building...
Are the batteries charged enough?
Are the wheels on all the way?
Did you use the correct types of pieces?
Are the gears jammed?
Are the motor wires plugged into the correct ports?
Are all the sensors set up properly?

If it isn't one of the problems above, there might be something wrong with the programming...
Did you give the motors enough power?
Did you set the motors to continue for a long enough amount of time?
Are all the blocks connected?
Are any of the wires broken or misused?
Are you sure you downloaded the program to your NXT?