Can you explain what is Critical path method and system model ?

and please type your answer

Production Systems, whether they are destined for metal products manufacturing, or the production of commodities such as food and agriculture products are efficient elements of a free-market system. Modeling these system allows us to predict their performance in the short term, and adjust and improve their components and structure in the long term. This assignment pertains to the production of eggs as a consumer product sold in supermarkets. The egg, as a source of protein which is often part of the breakfast meal, is mass produced in a unique production system. To the best of my recollection it starts with the process of incubating eggs in an incubator to produce chicks. Chicks are placed in chicken houses, with automatic feeders and waterers until they reach the egg laying age, when they moved to special fabricated wire cages which are stackable and connected to feed conveyers, and to a watering system. The floor on the cage is sloped to the front which allows the eggs to roll down to an egg collection and transport conveyor. The egg conveyor moves the eggs to the processing plant, where the eggs are washed, inspected, graded and packaged in cartons. The cartoons are packaged in boxes, which are pelletized, and moved to supermarkets in refrigerated trucks. The purpose of the assignment is as follows: 1. update the egg production system 2. Develop a system Model showing the supply chain network and the Distribution sub system. 3. Explore system response to a 20% increase in demand, using simple critical Path technique, commonly used in Project Management