1. Chapter : 4 Knowing what to do?? Group Members: Jyoti Sinha[B08011] Nikhil Verma[B08019] Rupesh Agrawal[B08026] Sreyans Sethia [B08034] Vineet Sekhani[B08042]

2. Agenda Classification of Constraints – Physical – Semantic – Cultural – Logical Application to everyday things – Doors – Switches Visibility & Feedback

3. Physical Constrains possible operations More effective if easy to see and interpret Classification of Constraints

4. Semantic Controlled set of possible operations due to meaning of the situation Knowledge can be powerful and important

5. Classification of Constraints Cultural Set of allowable actions for Social situations Guidelines for cultural behaviours: Schemas Knowledge structures Interpretation

6. Classification of Constraints Logical Relationship between spatial or functional layout of components E.g. : Indicators

7. Application to Everyday Things Doors The doors at the right show two excellent examples of design ???

8. Application to Everyday Things Doors Bad Door Design..!!!

9. Application to Everyday Things Switches Which switch is for which function…???

10. Application to Everyday Things Switches Good design of switch…!!

11. Visibility and Feedback Visibility: Make relevant parts visible Feedback: Give each action an immediate and obvious effect How to make things visible? o Good Display ( Washing machine,MP3 players) o Sound as a Feedback ( Laptop, Elevators )

12. Thank You