Designing instruction is like a mechanic diagnosing a car with trouble.

Designing instruction is like a mechanic diagnosing a car with trouble. Let me explain; imagine one morning your car doesn’t want to start. The mechanic is called and he comes out and takes your call to his shop. You both have no idea what is wrong with your vehicle. Instead of doing a complete diagnostic, the mechanic changes the oil and charges you for it. The car still does not start, so he changes the tire too. Before long he has topped off the windshield wiper fluid, changed the transmission oil, replaced the radiator, and installed new timing belts. After all that time and work the car still does not start. Then another mechanic comes along and discovers the battery is dead. Now a whole a lot of time and money have been wasted on changes to your car that were not necessary. Think of designing instruction as a complete diagnostic on a problem or situation that needs improvement.