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Unit 1: Project Planning8 min read
Project management relies on effective planning and scheduling to ensure timely and successful completion. Gantt charts and network diagrams are two fundamental tools that provide visual representations of project tasks, timelines, and dependencies, enabling project managers to monitor progress and identify critical paths.
A Gantt chart is a horizontal bar chart commonly used in project management to visually represent tasks scheduled over time. It provides a graphical visualization of a schedule, helping to plan, coordinate, and track specific tasks (or elements) in a project.
Project A Schedule
Task ID | Task Name | Start Date | End Date | Duration | Progress | --------|------------------|------------|------------|----------|----------| T1 | Planning | 2026-07-01 | 2026-07-05 | 5 days | █████████ | T2 | Design | 2026-07-06 | 2026-07-12 | 7 days | ██████░░░ | T3 | Development | 2026-07-13 | 2026-07-26 | 14 days | ███░░░░░░ | T4 | Testing | 2026-07-27 | 2026-08-02 | 7 days | ░░░░░░░░░ | T5 | Deployment | 2026-08-03 | 2026-08-05 | 3 days | ░░░░░░░░░ |
A network diagram is a schematic representation that shows all the tasks (activities) in a project, their interdependencies, and the logical flow of work required to complete the project. Unlike Gantt charts, basic network diagrams typically lack specific task due dates or durations but excel at visualizing the project's workflow and relationships.
The Precedence Diagramming Method (PDM) is a robust technique for constructing a project schedule network diagram. In PDM, each node (box) represents an activity, and the arrows connecting these nodes represent the logical relationships or dependencies between activities.
PDM allows for four types of logical relationships between a predecessor activity (A) and a successor activity (B):
+---+ FS +---+ SS +---+ | A |-------->| B |----------| D | +---+ +---+ +---+ | FF ^ | | FS v | +---+ | | C |-----------+ +---+
This C++ code snippet demonstrates how one might represent tasks and their PDM dependencies in a simplified program. It doesn't draw a diagram but illustrates the logical structure.
The Critical Path Method (CPM) is a project management technique used to identify the most important tasks (the critical path) in a project and schedule them to ensure the project is completed on time. It helps project managers determine the minimum time needed to complete a project.
The critical path is the longest sequence of dependent activities from the start to the end of the project. Any delay in a task on the critical path will directly delay the entire project's completion. Tasks on the critical path have zero float (or slack).
The Program Evaluation Review Technique (PERT) is a project management tool used to schedule, organize, and coordinate tasks, particularly in projects with uncertain activity durations. It provides a visual representation of a project's timeline and breaks down individual tasks.
Identify Project Tasks: List all necessary activities and events.
Define Task Dependencies: Establish the logical relationships between tasks.
Connect Project Tasks: Construct the network diagram using nodes for events/milestones and arrows for tasks/activities.
Estimate Project Timeframe using PERT Formula: For each task, estimate three durations:
The Expected Duration () for a task is calculated using the PERT formula: This formula gives more weight to the most likely estimate.
A horizontal bar chart that visually represents tasks scheduled over time, showing start/end dates, dependencies, and progress.
A schematic representation of project tasks and their dependencies, illustrating the flow of work required for project completion.
A type of network diagram where activities are represented as nodes (boxes) and arrows indicate the relationships or dependencies between these activities.
A project management technique for identifying the longest sequence of dependent activities (the critical path) that determines the minimum project completion time.
A project management tool used to estimate task durations and project completion times under uncertainty, utilizing optimistic, pessimistic, and most likely time estimates.
Test your understanding with 5 questions
Which of the following is a primary characteristic distinguishing Gantt charts from network diagrams?
In the Precedence Diagramming Method (PDM), what do the nodes typically represent?
The Critical Path Method (CPM) aims to achieve which of the following?
A project manager uses the PERT formula $(O + (4 \times M) + P) \div 6$ to estimate a task's duration. What do O, M, and P represent, respectively?
Which type of task dependency indicates that an activity cannot finish until another activity starts?
Manage Task Progress: Monitor tasks, close dependencies, and mitigate issues to ensure project completion.
6 Modules
6 Modules