Project planning is a subset of project management, and it refers to the use of schedules such as Gantt charts to plan and track progress within a project. Manual project planning or the usage of project management software are also options. Project planning is frequently used to arrange several aspects of a project, such as project plans, workloads, and team and individual management. An activity network diagram is used to define the logical relationships between tasks, allowing the critical path to be identified. Project planning is inherently risky because it must be completed before the project can begin. As a result, a weighted average of optimistic, regular, and pessimistic instances is frequently used to estimate work duration.