what is the purpose of the process control block
Process control block The role of the PCBs is central in process management: they are accessed and/or modified by most OS utilities, including those involved with scheduling, memory and I/O resource access and performance monitoring. It can be said that the set of the PCBs defines the current state of the operating system. Data structuring for processes is often done in terms of PCBs. For example, pointers to other PCBs inside a PCB allow the creation of those queues of processes in various scheduling states ("ready", "blocked", etc.) that we previously mentioned.
Control self-assessment Control self-assessment is a technique developed in 1987 that is used by a range of organisations including corporations, charities and government departments, to assess the effectiveness of their risk management and control processes.