TOCICO presentation - The "2 for 1" rule to reduce lead times and Work In Progress

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The “2 for 1 rule” to reduce lead times and work in progress (in production and projects)

TOCICO 2021 The Goal & Beyond

Dates & Information

  • Tuesday 22nd of June 2021
  • Conference in English
  • Followed by a Q & A session

Registration for this event are no longer available

The conference replay is available below


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(Theory Of Constraints International Certification Organization)

About the presentation

When applying the Theory Of Constraints it is often recommended to “choke the release” of materials. But organizations often have much too much Work In Progress (WIP) to begin with. What must you do before you can start using a TOC flow control solutions such as S-DBR or DBR?

Nearly all organizations need to go faster: they want shorter lead times and projects finished sooner. So how can they easily transition to a high-speed flow environment? Theoretically you could modify the parameters of your scheduling system to do this. But that is complicated, time consuming, dangerous and can be very disruptive. This is where the “2 for 1 rule” can be applied.

Lead times are directly correlated to the levels of Work In Progress. If we reduce WIP we reduce lead times. To reduce WIP we must ensure that more things exit the system than new things enter the system. The 2 for 1 rule states: “you are not allowed to launch a new thing into the system before you have finished 2 things”. Start finishing and stop starting!


In this presentation, few topics are covered:

  • How to choose the “things” controlled by the rule: work orders, projects, items, liters …

  • How to apply the “2 for 1 rule” in either production environments or project portfolios.

  • How to design the transition. Do I use "2 for 1" or should I do "3 for 2", or "4 for 3"?

  • How to update the ERP/scheduling I.T. system as flow accelerates.

  • How do I know when to stop using the rule!?

  • Our lessons learnt.

The presentation includes several examples from the authors 15 years’ experience of applying this rule in all types of industries both in production environments and project portfolios.

Watch the conference replay

About Philip Marris

Photo Portrait de Philip Marris

Philip Marris is the founder and CEO of Marris Consulting. He has assisted over 280 organizations throughout the world: Embraer, McDonald's, Louis Vuitton, Ariane (rockets), Procter & Gamble, Air France, Siemens, GSK, Safran, ArcelorMittal, SKF, Société Générale, Thales, Rolex, Veolia...


Nearly all the firm’s assignments are based on the Theory Of Constraints (TOC). Half are in production, the other half involve projects (Critical Chain Project Management). He is the author of the French bestselling TOC reference book « Le Management Par les Contraintes ». He often combines the Theory Of Constraints with Lean. He is active in increasing the awareness of TOC worldwide. He presents at over a dozen events every year. Marris Consulting’s YouTube channel, with its +300 videos is a well-known TOC resource.


He started his TOC journey in 1986 when he joined Creative Output France and started working with Eli Goldratt. Philip Marris started his career as a production engineer in the steel industry. Later he was responsible for the manufacturing operations in large consulting firms of over 1,000 people. He founded Marris Consulting in 2005. He has over 30 years of experience in industry and in consulting. He is English and is bilingual and bi-cultural. He lives in Paris, France.

The "2 for 1" rule in 5 minutes

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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