Programming CHIP

CHIP's highest-level goals were programmed C and runs on board. The RAP system is designed to deal with achieving goals in a dynamic environment. Each RAP task description encodes a set of methods for carrying out the task in different situations, a success check to tell when the task has accomplished its purpose, and notations that describe when things are not going as expected. At run time, a RAP task examines its methods and selects one that is appropriate in the current situation. By doing method selection at run time, RAPs are more likely to select the best method, even if the world is changing or contains details that cannot be predicted in advance.