1. Finding Classes Copyright © 1999 Patrick McDermott College of Alameda pmcdermott@peralta.edu A Quest: David, Earl of Huntingdon, 1120 from A Critical Inquiry into Antient Armour (1842)

2. A Class Tracks… An Entity : A Thing the Business needs to know about. At this stage, a business person should be able to understand every one of them. “Entity” is best defined by examples…

3. People George Romney (1734-1802) Emma, Lady Hamilton (1761-1815) 1786 Albrecht Dürer (1471-1528) Self-Portrait 1498

4. Places

5. Things Gustave Caillebotte (1848–94) Le pont de l’Europe 1877 Katsushika Hokusai 葛飾北斎 (1760-1849) Fuji from beneath Mannen Bridge in Fukagawa Fukagawa mannenbashi shita 深川万年橋下 36 Views of Mount Fuji 富嶽三十六景 Fugaku Sanjūrokkei ca. 1831-1834

6. Events Meeting of the Rails Promontory Point, Utah, 1869 Andrew J. Russell

7. Organizations Dorothea Lange (1895-1965) Richmond shipyards, 1943 Dorothea Lange (1895-1965) End of shift 3:30, Richmond, California September 1943

8. Examples of Classes Tangible People –Employees –Students Places –Shipping Locations –Offices Things –Equipment –Vehicles Intangible Accounts Cost Centers Departments Grades

9. You need a Class if… There’s a form There’s a number There’s a file There are several copies It’s Important NOTE— –Sections and boxes on Forms –The name might not be obvious They’re Everywhere!

10. Classes have Responsibilities Personification Helps –What if a person, not a computer, does it? –Obligation or Contract Know Things –Invoice: Know who the Customer is Do Things –Invoice: Compute Total