TOC en prod en ligne


The Theory Of Constraints in Production training is now offered online



More information and registration

CCPM Webinar


Critical Chain Project Management Webinar

On Tuesday 5th of December 2023
Webinar in English


Details and registration


CCPM Online Course


The Critical Chain Project Management training is now offered online


Details and registration


Bandeau Formation Lean


The keys to good Lean and the pitfalls of bad Lean

Next training sessions:

In our offices: On 30th of November 2023 (Fr)

Details and registration

CCPM Training V1.2


Critical Chain Project Management

Next training sessions:

In Paris, on the 14th of March 2024 (Fr)

Details and registration

Bandeau accueil site Marris Consulting 7

Theory of Constraints in Production

Next training session

In Paris on the 28th of March 2024 (FR)


Bandeau accueil site Marris Consulting 6


2-day Flash Diagnosis

Would you like our expert advice on how to go faster and further? 

We can help you to quickly identify the best levers to improve performance

More information

TOC en prod en ligne


The Theory Of Constraints in Production training is now offered online



More information and registration

Theory of Constraints (ToC)
and Critical Chain Project Management (CCPM) experts

Marris Consulting,
Experts in the Theory of Constraints consulting & training


Welcome to the Marris Consulting website, an industry consulting and training company focused on significantly and sustainably improving the performance of manufacturing and process industries.


We have over 25 years of experience combining the Theory of Constraints (ToC) with Lean to go faster and further: 1 + 1 = 3


As project management and performance improvement consultants, We help our clients worldwide reach and maintain ambitious levels of performance by combining actions on processes, organization, methodologies, tools … and people from the shop floor to the board room.

We are recognized experts in Constraints Management. We promote an integrated approach that combines the Theory of Constraints (ToC) to identify where to act and Lean and Six Sigma to improve performance.

We also use ToC's Critical Chain Project Management (CCPM) approach to boost project performance. We sometimes combine this with Lean Engineering (a.k.a Toyota New Product and Process Development System).

Our Supply Chain projects usually involve Demand Driven MRP (DDMRP).

Philip Marris, author of the french book "Le Management par les contraintes" (Constraints Management) is the founder and CEO of Marris Consulting.

Our motto: Factories, People & Results. 

Our 2-day performance diagnosis offer

You want to identify the constraint that limits your performance, but you need some help to do so? Marris Consulting offers a 2-day performance diagnosis led by Philip Marris and his team.


Discover our next conferences, webinars, events

Marris Consulting organises and participates in over a dozen conferences every year. Find all the conferences.


Marris Consulting hosts more than ten training sessions per year

Our programme: "Theory of Constraints + Lean", "Critical Chain Project Management", "Lean Management", "Lean Manufacturing", "Logical Thinking Process"...


Video of the month

What is the Critical Chain Project Management? Explanation in 3 minutes.

In this video, we explain the basic ideas of CCPM using an example project. But remember, you can use CCPM for all kinds of projects, like making new products, maintaining equipment, or developing software. Interested in learning how to make a CCPM plan or track your project with a Fever Chart?

Marris Consulting is a recognized expert in Theory of Constraints consulting and training. The Theory of Constraints (ToC) is a productivity and operational efficiency improvement methodology which emphasizes the importance of identifying the primary limiting factor (i.e. the constraint, or bottleneck) that prevents companies reaching their goal. By leveraging this constraint, organizations can achieve their goal while gaining greater control over operations. Constraints management provides a powerful set of tools to improve manufacturing processes, including Throughput Accounting and the Logical Thinking Process or Thinking Processes. The implementation of the Theory of Constraints has yielded remarkable results for companies all around the world.

Lean, also called The Toyota Way, originated in Toyota Motor Company. It is multifaceted and includes cultural and managerial elements such as “respect for people”, an emphasis on improving flow, a relentless quest for perfect quality… To explain the confusion often associated with Lean, we refer to “Good Lean” and “Bad Lean”.

As experts in operational excellence consulting and training, Marris Consulting assists companies in all their major processes (manufacturing, project management, supply chain, marketing and sales…) and uses various approaches to provide sustainable solutions to help its clients achieve the highest levels of performance (Critical Chain Project Management, Lean Manufacturing, Lean Engineering, ToC + Lean + Six Sigma…).

If you have doubts about the improvement actions to implement, our manufacturing consultants can conduct a 2-day performance audit and provide you with detailed recommendations that can be implemented in the short, medium and long term.

Our industrial management consultants also host several training sessions throughout the year (ToC, Lean, Critical Chain Project Management, Logical Thinking Process and more).

Vue de Paris

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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Tour Maine Montparnasse, 27éme étage
33, avenue du Maine - 75755 PARIS cedex 15

Tel. : +33 (0)1 71 19 90 40

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