PT Digital plans to launch a new e-learning platform in 5 months. The project manager, Mrs. Sandra, is tasked with developing a comprehensive project plan. She begins by gathering input from stakeholders to define the project scope, developing a Work Breakdown Structure (WBS), and identifying key activities. After that, she begins to explain each activity in its sequence and estimate the duration of each activity.

Based on the story above, what are the steps taken by Mrs. Sandra in arranging the sequence of activities and their duration?