We have already discussed schedule network diagrams, but we haven't mentioned bar charts and milestone charts yet.
Here is a schedule screenshot taken from MS Project software. These bars visualize the start and end dates of the activities. This is called a bar chart, or, in other words, a Gantt chart. The milestones represent important dates to achieve. For example, in this milestone chart, it shows that construction work starts on the 22nd of March.
Once we develop the schedule, we need to get approval for it. Once it is approved for the first time, it becomes the schedule baseline. Therefore, the schedule baseline is the first approved version of the project schedule. We are free to make changes to the schedule during its development phase without needing to create any change requests. However, once it is approved, we need to create a change request to make any changes. We can alter the baseline only after receiving approval for the change request.
When we prepare the project schedule, we also prepare project calendars. These calendars represent working and non-working days as well as holidays. We may need to create separate calendars for different resources. For example, if we have part-time resources working on our project, we need to create a separate calendar to represent which days and how many hours these resources work.