Marris Consulting's team wishes you all the best for this new year

Des usines des hommes et des résultats Marris Consulting

Theory Of Constraints in production

Next training sessions:

On-site, on 24th of March 2022 (Fr)
Online, from 25th to 28th
of April 2022 (En)

More information and registration

Our YouTube channel has exceeded 400,000 views!

More than 300 videos: customer testimonials, training extracts, conferences, ...

And many more to come!

Our YouTube channel

How to boost your project portfolio performance beyond your expectations

A breakfast - conference by Philip Marris

On 10th of February 2022, in our Parisian offices

More information and registration

Des usines des hommes et des résultats Marris Consulting

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

Critical Chain Project Management

Next training sessions:


In Paris, on the 10th of March 2022 (fr)
Online, from 10th to 12th of May 2022 (en)

Details and registration

The keys to good Lean and the pitfalls of bad Lean

Next training sessions:

From 1st to 3rd of February 2022 (En)

In our offices:
On 23rd of June 2022 (Fr)

Details and registration

Reducing the duration of investment projects... and finishing them on time!

Watch clients' testimonies from one of our Critical Chain implementation in the pharmaceutical industry

To learn more about the results obtained

Marris Consulting's team wishes you all the best for this new year

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

Marris Consulting,
Experts in 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 of 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 worlwide 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 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

The carrying cost of inventory

Philip Marris, CEO at Marris Consulting, explains why the cost of inventory is often under-estimated by the traditional accounting methods.

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).

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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 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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