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1. OPERATORS : K - to press a key or button
P - to point with a mouse to a target on a display
H - to home hands on keyboard or other device
D - to draw a line segment on a grid
M - to mentally prepare to do an action or
closely related series of primitive actions
R - to symbolize the system response time during
which the user has to wait for the system
- each has an estimate of execution time or simple approximating function
2. Does not require computational representation because methods are supplied by analyst and are expressed in sequence form and all information processing is assumed to be contained in the primitive operators
3. it is the easiest to apply in actual interface design practice and simplest to explain and justify to computer software developers