What is the triangle of project management?

The triangle of project management is composed of time, cost, and scope, which together influence quality. This concept is often referred to as the 'iron triangle' or 'triple constraints'. The idea is that altering one aspect, such as the project's budget, timeline, or scope, will consequently impact at least one of the other elements.

Last edited on: 14 Jul 2026
Can a project belong to more than one programme?
Do project managers write business cases?
How do you compare programme and project management?
How do you plan for a project or programme?
How hard is project management?
How is Agile PM different from traditional PM?
Is project management hard to learn?
Is Scrum Agile or waterfall?
What are KPIs in project management?
What are the 5 phases of the project life cycle?
What are the 5 stages of project management?
What are the 5 W's of project management?
What are the basics of project management?
What are the five phases of a project?
What are the phases of PM?
What are the three most important things in project management?
What do you mean by Agile project management?
What does the Gantt chart stand for?
What is a program vs project life cycle?
What is a project life cycle?
What is Agile PM vs waterfall PM?
What is Agile working in project management?
What is difference between project and program management?
What is project management in simple words?
What is the 80 20 rule for project managers?
What is the Agile methodology in project management?
What is the difference between Agile and waterfall?
What is the difference between enterprise change and project change?
What is the difference between PM and Agile?
What is the difference between programme & project management?
What is the difference between project and programme management?
What is the life cycle of a project?
What is the RACI matrix used for?
What is the triangle of project management?
What is WBS in project management?
What project management means?
See all Project management FAQs

Project Management related articles

Is it worth doing a project management course?
Is it worth doing a project management course?
image
Simon Buehring
Is a project management course worth your time and investment? Discover the potential career benefits and make an informed decision by reading on.
What is the best project management certification in 2026?
What is the best project management certification in 2026?
image
Simon Buehring
Confused about which project management certification to pursue? Compare the most recognized certifications and find the best fit for your career.
PMO structure
PMO structure
image
Simon Buehring
Explore various PMO structures and their impact on project success. Read on to determine which PMO setup best suits your organization.
The Rise of AI: How AI is Revolutionising Project Management
The Rise of AI: How AI is Revolutionising Project Management
image
Sevcan Yasa
Discover how artificial intelligence is reshaping project management. Watch our webinar recording of Mashhood Ahmed to gain innovative insights and practical applications.
Project quality management
Project quality management
image
Knowledge Train
Unlock the secrets to better project outcomes with project quality management. Explore essential principles, practices and strategies to ensure excellence in your projects, and discover why quality matters.
Waterfall method
Waterfall method
image
Knowledge Train
Learn about the linear and sequential approach to software development and project management called the waterfall method. The article will detail the steps, pros, and cons of this method.
RACI matrix in project management
RACI matrix in project management
image
Knowledge Train
The RACI matrix is an indispensable tool for project managers. In this article, we’ll show you how to use it to optimise communication and streamline decision-making on your projects.
Managing small projects
Managing small projects
image
Simon Buehring
Can large project management practices be scaled down? Explore the application of these practices in smaller projects by reading further.
PRINCE2 Agile resources
PRINCE2 Agile resources
image
Simon Buehring
For this article we have curated the best resources about PRINCE2 Agile, including those from Keith Richards, the author of PRINCE2 Agile, and an agile thought-leader in the UK.
Project management benefits
Project management benefits
image
Knowledge Train
Project management offers a wide range of benefits for businesses. Let’s look at the most important of them and how they can help you to grow your organisation and boost the bottom line.
Project management frameworks
Project management frameworks
image
Knowledge Train
Explore essential project management frameworks and discover how these can enhance your effectiveness. Understand the structured approaches behind these frameworks for successful project outcomes and improved team collaboration.
Agile PMO
Agile PMO
image
Simon Buehring
Learn how a PMO can enhance organization value by supporting project goals. Discover the role of a PMO in modern business by scrolling down.