National Oil Company (NATOCO)must plan the shutdown of its Houston refinery for routine preventive maintenance.Each hour of downtime is lost production time and is very costly,so NATOCO wants the maintenance project completed in 22 hours.The PERT network below shows the precedence relationships of the activities involved in the project.The table gives the activity times and costs under normal operations and maximum crashing. 
NATOCO wants to know the minimum cost of completing the maintenance project within the 22-hour period.Formulate and solve a linear program that will yield this information. 
Definitions:
Response-Outcome Relations
The understanding or concept in psychology that focuses on how actions (responses) are connected to their consequences (outcomes).
Species-Specific Predispositions
Innate behavioral tendencies or characteristics that are unique to particular species, influencing their ability to learn or react in specific ways.
Concurrent Schedules
In operant conditioning, it refers to two or more reinforcement schedules that operate simultaneously for two or more behaviors.
Observational Learning
A learning process whereby individuals acquire new behaviors or information by watching and imitating others.
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