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A P&ID shows a process designed in a logical manner. The drawings typically include process flows, and describe the basic control functions. The P&ID shows all process components, and provides a solid reference point for troubleshooting process problems. P&IDs also provide the basis for hazard analysis before actual physical installation of a process. The P&ID is a tool for maintenance and operations to help troubleshoot problems. As the process is changed or updated, the P&ID should be updated to track changes and provide a historical record of the process. The amount of detail in a P&ID set needs to be complete enough for personnel to understand how equipment is operated without so much detail that it is hard to follow.