How to Write a Function

1. How to Write a Function

2. Knife Cuts Bread Function = Product + Modification + Tool Tool Modification Product

3. Bread Product = Material object that gets modified Substance Element “Product”

4. Cut Bread Modification (Shorthand Verb) = Change or control a feature of the product Modification Product

5. Change Number of Pieces Bread Modification (Longhand form) = Change or control a Feature of the product Cut Bread

6. Modification Exercise Restate the modifications in longhand Vaporize Turn Heat = Change Energy or degree of separation of the molecules = Change Temperature = Change Angular Position and depth of penetration Water Argon Screw

7. “Tool” Knife Cuts Bread Tool = Material Object which delivers the Modification Modification Product

8. Excessive Useful but Flawed Useful Harmful Types of Functions

9. Tests for Correctly Written Functions 2.Are the tool and product something you could drop on your foot? Physical or virtual Objects 3.Does the modification describe physical change or control of the product? Use longhand (changes . . . Or Controls . . . ) if confused. 4.Does the tool directly modify the product? 1.Are all of the Parts Present? Tool Pan Pan Flame Pan Changes Temperature Modification Heats Heats Heats Product Water Water Water Water 6.Does it describe what is really happening? Be Careful with Confusing Functions 5. Is the correct function symbol used? Dryer Dryer Flawed Useful Sufficient Useful Excessive Useful Harmful Dries Moves Clothes Moisture