Project Scheduling Tools And Methods

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Project scheduling tools and techniques used in develop schedule process are not just important only for the PMP exam. But also very important for every project manager to understand these concepts and implement these project scheduling tools and techniques in their projects.

In this post, we will discuss critical path method as one of the tools, and hence just in case if you are not familiar with this topic, please read through my detailed blog post on critical path method (CPM).

In the time management knowledge area, every output generated from all other time management processes will become the input to developing the schedule process.



Following are the project scheduling tools and techniques used in developing the scheduling process.

  1. Critical path method (CPM)
  2. Critical chain method
  3. Schedule compression techniques
    1. Crashing
    2. Fast tracking
  4. Resource optimization techniques
    1. Levelling the resource across the project – Resource levelling
    2. Balancing the resource demand vs supply – Resource smoothing
  5. Modelling techniques
    1. What-if analysis
    2. Simulation (Monte Carlo analysis)
  6. Leads and Lags
  7. Scheduling Tool
  8. Schedule network analysis



Critical path is the longest duration path in the project schedule network diagram. And the method to find the critical path is called critical path method (CPM). If any of the activities in the critical path delays, that will delay the whole project. Critical path is mainly used to find out

  • Activities which are at high risk in the project
  • Float of each activity, which is not on critical path
  • What is the project’s end date

Please read through the detailed blog post on critical path method (CPM) in order  to familiar with the critical path concept, which is very important for the PMP exam.

The critical path method is one of most important project scheduling tools and techniques used for developing project schedule.



Critical path method (CPM) only considers the dependencies in the project. It assumes that resources are available across the project duration for use.  However practically you may see resource constraints on the projects.

Also while getting the activity durations from the project team, the team may provide the activity durations by considering implicit buffers for every activity. Adding buffers to every task or activity is unethical, as it increases the project cost.

On the other hand, critical chain method considers resource constraints as well as dependencies. Also critical chain method assumed no buffer at activity level, and assumes buffer only at critical milestones of the project or towards the end of the project to deal with any uncertainties in the project.

Once important point to remember in critical chain method is that, the project team does not know about the buffer, as the buffer is not at the activity level. Hence project team still targets the completion of activities according to the activity duration (without any implicit/explicit buffer), thus overcoming the student syndrome. Student syndrome in project management is a term that refers to the practice of people not starting majority of their work until the last possible minute.



In short, fast tracking and crashing are the schedule compression techniques used, when the project schedule or some of the activities in the schedule has chances of slippages.

A detailed blog post is created on what is schedule compression techniques and how are they used in project?

As part of project scheduling tools and techniques, schedule compression techniques are very handy for the project manager to shorten the schedule.



Crashing is a schedule compression technique which will add more resources to the activities to shorten the schedule.



On the other hand, fast tracking is about identifying the activities that can run in parallel to the portion or extent of the schedule.



When scheduling the project initially, we only focus on the sequence of activities and their dependencies. This may result in unrealistic resource requirements. By applying resource optimization techniques we can make sure that the planning of resource utilization across schedule is done in a realistic manner, usually according to the organization policies. There are two resource optimization techniques available. They are

  1. Resource Levelling
  2. Resource Smoothing



Eventually resource levelling is the first resource optimization technique used in developing the project schedule process. Resource levelling applies the resource constraints on project activities to adjust the start date or end date of the activities depending on the availability and Predefined threshold set for the resource usage.

For example, considering the dependency of the activities, they are sequenced and some of the resources are planned to working more than 45 hours a week. However organization policy is to work only 8 hours a day for a 5 day week, then the project manager has to apply resource levelling technique to adjust the project activities and may be the schedule to consider this limit of 40 hours a week usage for every resource.



After the resource levelling is done on the project, still you may see some resources are overly used during some portion of the project schedule. Although the overall threshold limits are met after applying the resource levelling, the resource demands might not be balanced with respect to the supply of the resources.

Eventually resource smoothing is to ensure that the resource demand is balanced over a period of time, considering the resource supply.

Meaning that if a resource is plan to work more hours in the early phase of the project, and less in the later phase of the project, resource smoothing will try to balance the resource usage for the whole duration of the project, where possible.

Again for the purpose of resource smoothing, project schedules must not change in the normal circumstances. Hence the project manager needs to see the available floats or slacks across the activities and accordingly the resource smoothing technique must apply without impacting the project schedules.



There are primarily two modelling techniques to model the uncertainties in the project. They are

  1. what if analysis
  2. Simulation


Sometimes it makes sense to think about all possible problems in the project, by predicting what and all can go wrong in the project. What if the analysis is a popular technique that determines all the possible uncertainties in the project? This technique is about thinking about everything that may go wrong in the project. This technique will use a questionnaire with the format of the question as “What if something goes wrong?

For example what if a resource is not available for during a specific activity, this way you can figure out the ways to deal with such problem occurrences.

What-If analysis is a very popular technique during the risk management of the project.



The same what-if analysis or risk analysis was done using a computer algorithm to model the uncertainties in the project. In this method, you assume different project durations and assumptions to consider the uncertainty in the project.

While this is not a commonly used technique in project management, some project managers use this method as an extremely useful one.



Leads and lags are extremely useful on dependencies in project management.  These are useful techniques while developing the schedule of the project.

In short, lag is introducing a delay on the success activity, with respect to its predecessor activity.

On the contrary, a lead is a certain amount of time; a successor activity can advance with respect to its predecessor activity.



Eventually, a scheduling tool helps you to

  • chart out the activities in the projects
  • Mark the relationships or dependencies among activities
  • Apply leads, lags, schedule compression and resource levelling techniques
  • Specify duration with which the tool calculates automatically the schedule of the project
  • Automatic updates to the project schedule when any of these parameters change or adjust.

Many of us know and use some of the other project scheduling tools such as MS project, and Open Project, etc.



Schedule network analysis about what we have learned so far on how to analyse the project schedule activities using various methods that includes

  • Creating the network diagram
  • Figuring out the critical path using the critical path method (CPM)
  • Finding the float using the critical path
  • Finding out the early start, early finish, late start, and late finish



To conclude, we have seen several project scheduling tools and techniques used in developing a project schedule process as part of time management knowledge area.

We have touched some important project scheduling tools and techniques such as fast-tracking and crashing. These project scheduling tools and techniques are very handy for the project manager to shorten the schedule.

Also, we have seen how the project manager uses project scheduling tools and techniques such as resource optimization techniques such as resource levelling and resource smoothing to balance the resource demand versus supply.

Finally, we have concluded by understanding the other tools in developing the project schedule such as modeling tools, leads and lags, schedule tool, schedule network analysis, critical path method (CPM) and critical chain method (CCM).

Source: SCHOLAR99