# What is the Critical Path Method in Project Management? | Capterra | Capterra > Read our guide to the critical path method in order to learn how to map out large and complex projects, identify key tasks, and complete projects on time. Source: https://www.capterra.com/resources/what-is-critical-path-method --- Project PlanningProgram & Project Management # What Is the Critical Path Method in Project Management? By Laurenzo Overee Laurenzo Overee Laurenzo Overee is a writer specializing in employee engagement, leadership training, and digital solutions topics. He is a guest contributor to small busine... [See bio & all articles](https://www.capterra.com/resources/author/loveree/) Published December 13, 2022 5 min read Table of Contents - [What is the critical path method?](#what-is-the-critical-path-method) - [Why use the critical path method](#why-use-the-critical-path-method) - [How to find the critical path of a project](#how-to-find-the-critical-path-of-a-project) - [Critical path analysis example](#critical-path-analysis-example) - [Optimize the critical path method for your projects](#optimize-the-critical-path-method-for-your-projects) ## Are you constantly struggling with multiple task timelines? Applying the critical path method can help put things into a clear perspective. The critical path method (CPM), also known as critical path analysis, is a simple but effective project management technique. Users can apply CPM in analyzing, planning, and scheduling the most complex projects and may combine it with program evaluation and review techniques for optimal results. ## What is the critical path method? CPM identifies the necessary tasks required for completing a project. The project management technique determines scheduling flexibilities to help teams handle task efficiencies while managing realistic time frames for their projects. A collaboration between DuPont and Remington Rand UNIVAC saw the development of the CPM technique in the 1950s[\[1\]](#sources) as a solution for reducing the cost of inefficient scheduling practices. A CPM approach usually involves the breakdown of relevant project activities, activity duration, and the relationship and dependency between tasks and logical endpoints such as project milestones. Benefits of a critical path analysis A critical path analysis enables your team to assess and analyze project activities while promoting resource management. For instance, CPM helps teams communicate project plans and schedules, driving improved cost management and performance. Task segregation (into critical and noncritical groups) can help you prevent project bottlenecks by running certain activities concurrently. Also, CPM presents a practical and organized base that effectively guides teams toward fulfilling project objectives with reliability. Your team may apply CPM as an accurate benchmark for future projects based on real-world expectations and observations. What is a critical task? Essentially, you may consider the critical path the longest possible sequence of activities that teams must finish on schedule to complete a project. As such, the slightest delay observed in each stage of your CPM will push back the completion of the entire project. ## Why use the critical path method Ultimately, using the CPM helps teams prioritize and manage multiple contingencies and necessary fixes to keep your most complex projects running smoothly according to schedule. The CPM works well, especially during peak periods when teams juggle several projects that compete for their limited time, resource, and attention. Essentially, your project managers and stakeholders may apply the CPM to manage expectations and realistic deadlines from the beginning of your project. ## How to find the critical path of a project You can define the critical path of a project through a meticulous process that identifies the correlation between project activities and puts your tasks into a clearer perspective. Although modern automated software solutions can help your team figure out the critical path of your project through algorithms, you can choose to perform a manual calculation instead for a greater understanding of your project flow. ### List all project activities A complete specified listing of your project activities provides a bird's-eye view of each task and its correlations. Applying a work breakdown structure can help systematically manage each task dependency associated with your deliverables. ### Define the project dependencies There are four primary types of dependencies in project management. These dependencies include finish-to-start, finish-to-finish, start-to-start, and start-to-finish relationships. A CPM approach requires you to identify every single dependency in every project phase to create a critical path. ### Create a critical path network diagram Modern visual workspaces can help your team create critical path network diagrams that visualize critical path networks through customizable templates for easy reference and management. These network diagrams will present a flowchart that displays how your tasks interrelate. ### Estimate task duration/timeline Your visual workspace tools can also help tabulate task durations and timelines to determine the priority of each task and how they compare with other activities in your project. You can make estimations based on historical project data, industry trends, and conjectures guided by knowledge and expertise. ### Calculate the critical path Once you have fully tabulated project task durations and timelines, you can identify the critical path as the sequence of activities with the lengthiest duration. ### Determine floats The float or slack within a project refers to the degree of flexibility for a specific task. As such, floats inform your team about the workable leeway available without impacting the overall project progress. There are two types of float to consider in your CPM: total and free. Your CPM’s total float value equals your project’s late start time - early start time or late finish time - early finish time. For free float calculations, you may take the next task - the current task. The total float determines the allowable time for delaying an activity from the early start date, which does not compromise the project finish date. Similarly, free float refers to the task delay time that does not affect the following tasks. ### Revise as needed Revise your CPM when required since your schedules depend on estimated activity durations. You can compare your original CPM with measured real-time CPM values of your projects for improved assessments of future projects. ## Critical path analysis example A project manager begins the CPM process by considering the number of attributes for each project activity, which determines its duration. These attributes may include: - Early Start (ES) - Late Start (LS) - Duration (the estimated time for task completion) - Early Finish (EF) - Late Finish (LF) - Float/Slack While the manager cannot predict every possible attribute, critical path analysis can help identify them. For instance, if a predecessor task requires 20 days for completion, it inherits the predecessor’s EF as its ES. As you work through your project with CPM, you will observe the correlations[\[2\]](#sources) between the LF and EF of activities, establishing the float value that determines the flexibility of your tasks. ## Optimize the critical path method for your projects CPM-based programs offer visual presentations with timeline views, customizable templates, and collaborative tools that keep multiple projects on track with consistent success. Visit Capterra’s [CPM-friendly project management software](https://www.capterra.com/p/146136/Lucidchart/alternatives/) to help you prioritize your project management without exception. ## Capterra's 2026 Software Buying Trends Report ### Download our 2026 Software Buying Trends Report to see how successful software adopters avoid disappointment and how your business can, too. * * * Sources 1. [CPM - Critical Path Method](http://www.netmba.com/operations/project/cpm/#:~:text=In%201957%2C%20DuPont%20developed%20a,CPM\)%20for%20managing%20such%20projects.), NetMBA 2. [Critical Path Method](https://jexo.io/blog/ppm-glossary-critical-path-method/), Jexo * * * ### Was this article helpful? * * * ## About the Author [### Laurenzo Overee](https://www.capterra.com/resources/author/loveree/) Laurenzo Overee is a writer specializing in employee engagement, leadership training, and digital solutions topics. 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