# How Primavera P6 Works

How Primavera P6 Works? Primavera P6 Project Management Software is a leading software in Project Management. It can help the Planning Engineers to create a good comprehensive schedule to guide the project based on targets. In this article, we will explain you about How Primavera P6 Works simply. This will help you to understand P6 scheduling basics, including what is critical path in Primavera P6.

## How Primavera P6 Works

How Primavera P6 Works? It is actually quite simple. Before the era of Project Management Software, we did the project scheduling by manually calculate the schedule by Critical Path Method. Primavera P6 is here to help us to create good scheduling with Critical Path Method in better way. This CPM in Primavera P6 is extremely useful for scheduling.

The Critical Path Methodology is a mathematical algorithm for planning or scheduling project activities. So, here is basically how Primavera P6 works:

### P6 Scheduling Basics

Critical Path methodology scheduling is a mathematical process and it has a list requirements to meet before it can work it’s magic.

Before you can work with the Critical Path Method (or run Primavera P6 Scheduler), you have to prepare several things:

• List of Activities
• List of Activities Durations
• Relationship between Activities

The two first points above are the most important things. The third point is also a must so that you can clearly determine your critical path of your project scheduling.

### Scheduling Process

How does the scheduling process in Primavera P6 work? The Critical Path Methodology process in Primavera P6 pass through your project activity by activity twice.

It begins with the first activity and step forward – this can be called the Forward Pass. For every activity, it assigns or computes that activity’s Early Dates.

Early Dates is defined ass the most optimistic start and finish dates in your schedule work activities.

The Backward Pass goes next. This part you begin at the last activity in your schedule network, and move backward determining dates to each activity, until you get the first activity in the network. These important dates are usually called as Late Dates.

This is basically just as working in manual PERT diagram. See the picture below for illustration.

Late Dates determine the latest your activities can start and finish without delaying the project finish date. This is simple yet important information for you.