Project Buffers discussed by Sanjeev Gupta and Philip Marris

Philip Marris interviews Sanjeev Gupta from Realization Technologies


Sanjeev Gupta, founder and CEO of Realization Technologies, editor of Concerto software, and Philip Marris, CEO of Marris Consulting, discuss about project buffers.

Warning: This video assumes in depth knowledge of CCPM (Critical Chain Project Management).
An unprepared viewer will find it hard to understand and indeed disconcerting.

Sanjeev Gupta was one of the speakers at TOCPA Paris in March 2018

The TOCPA Paris 2018 conferences 



To enhance your experience, Marris Consulting organizes training sessions on Theory Of Constraints applied to production and projects environments


Critical chain project management training

Video summary:


How and why calculate the size of a CCPM buffer. Sanjeev Gupta argues that often the size of a buffer cannot be calculated, it will be imposed by the environment (the client for instance). The buffer decouples the critical chain (the critical part of the project) from the non-critical tasks.

Philip Marris then comments on the fact that buffer sizes are often calculated based on the variability of the durations of the individual tasks often assuming that the main uncertainty is the variability of the duration because of the unknowns in the task (“we have never developed this kind of product before”). In fact the major cause of variability is nearly always other factors such as incomplete kits of information, forgotten tasks, excessive multitasking, etc.

They then discuss how to ensure that the people doing the projects always give the true focused durations without adding local safety buffers. They consider that one of the key issues is the confidence the employees have in their management (will the management accept that durations can be longer than the average focused time.

Marris Consulting, expert in Theory of Constraints & Critical Chain Project Management


Marris Consulting is an expert in the Theory of Constraints (ToC) and Critical Chain Project Management (CCPM). As industry consultants, we are focused on helping process and manufacturing industries reach their highest levels of performance by using Constraints Management  combined with Lean and Six Sigma. We also use Critical Chain Project Management which we sometimes combine with Lean engineering to improve project performance. If you are unsure about the actions which need to be implemented to improve operational efficiency, our industrial management consultants can also conduct a performance audit. Furthermore, our experts host numerous Theory of Constraints (ToC), lean and project management training sessions throughout the year.

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About Marris Consulting

Marris Consulting is an industry consulting and training company specialized in the Theory of Constraints (ToC) and Critical Chain Project Management. We focus on improving the performance of manufacturing and process industries by using Constraints Management combined with Lean and Six Sigma. To boost project performance, we also use Critical Chain Project Management (CCPM), which we sometimes combine with Lean Engineering. Our 2-day performance audits, our performance consulting services and our project management, Lean, ToC & CCPM training by our industry consultants offer a wide range of solutions to help our clients around the world reach the highest possible levels of performance.

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