How to Define Critical Path in Microsoft Project

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Here’s a step by step guide: 

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1. First, open your Microsoft Project file and switch to the 'Gantt Chart' view.
2. Next, navigate to the 'Format' tab in the ribbon under 'Gantt Chart Tools'.
3. In the 'Bar Styles' group, locate and check the box for 'Critical Tasks' to highlight all tasks that lie on your project's critical path.
4. There you have it! Your critical path tasks now appear in red on the Gantt chart. Remember, these are the tasks with zero slack time.