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  Three State Process Model in Operating System Pre-requisites:  States of a Process in Operating Systems ,  Two-State Process Model in Operating System In this article, we’ll be discussing a three-state process model in an operating system and also discussing the need for this process model, how the process executes, what will be the possible transition that can occur, and last its benefits and some drawbacks. Before, learning about the below three-state process model, it is recommended to read the previous two-state process model. Need for Three-State Process Model The two-state process model was an amazing process model consisting of only two states i.e, running and not-running, that means when the process is running it will execute, otherwise not and the CPU will sit idle. The major drawback of using a two-state process model is that when the dispatcher allows a new process to enter from not-running to the running state, the process might still be waiting for some oth...