The timescales must be realistic and, in practise, the project manager will probably have discussed timescales with the team before the schedule was finalised. They will also need to understand the criteria by which each task is determined as complete.
A Gantt Chart is an excellent project management tool for the scheduling, budgeting and reporting of a project. The easiest, but perhaps not the most useful, tool for creating Gantt Charts is MSProject. Each task is listed on the left-hand side of the chart with a timeline shown on the right. Milestones can be easily marked and the schedule and costs can be easily updated where necessary.