Planning

Question 1

The STRIPS representation for an action consists of what?

Answer 1

Preconditions: a set of assignments of values to variables that must be true for the action to occur

Effects: a set of resulting assignments of values to those variables that change as the result of the action

Question 2

What is the STRIPS assumption?

Answer 2

All of the variables not mentioned in the description of an action stay unchanged when the action is carried out.

Question 3

What is a causal rule? What is a frame rule?

Answer 3

Rules: specify the value of each variable in the state resulting from an action.

Body of the rules:

• Features values in the previous state
• Action carried out.

Rules have two forms:

• Causal rule specifies when a feature gets a new value.
• Frame rule specifies when a feature keeps its value.