webinaire toc dans l'horlogerie


Webinar: Theory of Constraints in the watch industry

Thursday 20th of June 2024, 12am to 12:45am Paris time (CET or UTC+1) 


Bandeau accueil site Marris Consulting


Webinar: Accelerate MRO with TOC

Friday 5th of July 2024, 12am to 12:45am Paris time (CET or UTC+1) 


Critical Chain in New Product Development

When you have no other choice but to deliver quickly a new product, Critical Chain is probably the most suitable option


Free webinar, in English, on 3rd of July 2024


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

webinaire toc dans l'horlogerie


Webinar: Theory of Constraints in the watch industry

Thursday 20th of June 2024, 12am to 12:45am Paris time (CET or UTC+1) 


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.


Video of the month

Poka Yoke the Toyota Way by Reynald Debaut-Henocque

In this video, Reynald Debaut-Henocque describes the purpose of Poka Yoke and how to set them up, Toyota-style

Marris Consulting offers more than a dozen training sessions per year.

Marris Consulting provides numerous training courses each year:

  • Theory of Constraints in Production: This training combines the principles of the Theory of Constraints with Lean Management methods. Its aim is to identify and eliminate obstacles that hinder operational performance while optimizing processes to increase efficiency.
  • Critical Chain Project Management: This training focuses on the project management approach based on Critical Chain. It aims to identify the true constraints of a project and manage them proactively to ensure on-time delivery.
  • Lean : This training focuses on Lean Management principles, with insights from a former VP of Toyota Motor Manufacturing France. It will discuss the good Lean, that of Toyota, versus the bad Lean.
  • Logical Thinking Process : This training focuses on using logical thinking to solve complex problems and make strategic decisions. It provides tools and techniques to analyze situations systematically and effectively.

All these trainings are available in-person or online, and are conducted in French or English, depending on participants' preferences and needs.

All Marris Consulting trainings

Our upcoming in-person trainings:

Theorie of Constraints training

Face to face Critical Chain Project Management training

Face to face Lean training

6-days training LTp Thorsteinn

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).

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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