Pareto’s 80/20 is for independent events, but your team and company are heavily connected. There you always have one constraint, which means one lever to pull: 99/1. This guide shows you how to find it and use it.

You get three hands-on templates for the most common flow problems: low team output, projects at risk and overcrowded portfolios. Each one takes three simple steps and includes bonus tips. The bonus fourth template turns your results into a business case your executives will approve.

The WHY, the WHAT and the HOW - of 99/1 one-lever.com

Critical Chain Project Management is our flagship product. Here we have experinece in over 50 implementations. And all these learnings are now available in this book.

All you ever need to know about Critical Chain!

If you want to reach a breakthrough in performance of your teams or organizations - there is no way around Theory of Constraints. It's allso the base of all of our 99/1 one-lever.com products - because the constraint is the one lever to pull.

This book contains 15 independet chapters - from the basics of TOC to the most advanced concepts how to implement it fast in organizations.

If you want to make things happen, you need to clearly explain WHY. The more compelling your reasoning, the greater the acceptance and support your proposal will receive.

This document presents a state-of-the-art approach to calculating, building, and communicating real growth business cases.

It helps you demonstrate the true business value of your ideas, make a convincing case for change, and gain the support you need to turn your proposals into reality.

Teams often struggle with too much work in progress, constant interruptions, and disrupted workflows. Many already use Kanban boards or other types of task boards to make work visible and improve transparency—but visibility alone doesn't guarantee smooth flow.

This InfoPackage provides practical guidance, proven techniques, and actionable ideas to help your team implement or optimize task boards, reduce disruptions, and dramatically improve workflow efficiency.

Discover how to achieve a smoother, faster, and more reliable flow of work—in just a few days or weeks, without complex tools or major changes.

One of the biggest challenges in both traditional and agile projects is dealing with disruptions and surprises—staying agile and flexible while still meeting promised deadlines.

The key is active buffer management, using fever curves as clear, visual early-warning signals.

This download package provides everything you need to introduce and apply this approach in your team or project, combining agility + reliability = trust.

Keeping a clear overview of workloads and available capacity is absolutely essential when you want to reliably deliver a portfolio of projects or releases.

Many people assume this requires complex tools, extensive effort, and sophisticated planning. It doesn't!

With these simple Excel tools, you can easily visualize workloads and capacity, set realistic due dates, explore different scenarios, and even optimize the business value of your project portfolio—all with minimal effort and no need for expensive or complex software.

The package also includes a straightforward project progress tracking tool, providing a practical starting point for managing projects in a wide range of environments.

When we talk with executives and business managers, we ask them about their strategy. Very often they show us slides and tell us a lot – all very nice.

But one question is enough to spoil the show: “And what does this have to do with the constraint of your organization?” Silence.

This booklet contains several short dialogues between Christian Reckel and me on exactly this question: how to set up a really good strategy, one that’s connected to the constraint, and how easy it is to explain afterwards. No slides, no blah-blah – just clear speech.

When we talk with top executives and senior managers about the Theory of Constraints, we typically stumble over the pitfalls of conventional cost accounting, and why it leads to such bad decisions.

This is often a real eye-opener! Most managers have never thought about where cost accounting came from, or whether it’s right or wrong.

In this booklet, I talk with Nik Baumann, a very experienced financial controller and Theory of Constraints practitioner. It’s an introduction to the alternative, Throughput Accounting, and much more…

There was a time when everyone talked about “agile methods,” but if you asked, “Why do they work?” – silence. Agility isn’t about following recipes. It’s about deeply understanding the mechanics behind it.

So ten experienced agilists founded the Special Interest Group “Agile Management” within the German Society for Project Management and dug deep – very deep.

This book doesn’t explain agile methods. It explains the scientific foundation of agility! And these are valid for all kind of projects and organizations - they are general.

What about you: how many of your meetings with your team or your customers actually lead to a change in behavior? I asked my peers in the DolphinUniverse this question, and the answer was around 40%, but not much more! For anyone leading or supporting change, that’s dramatically low.

So we set out to find what makes the difference.

This booklet shares what we found. In the end, it’s simple: just one thing decides whether a meeting is time spent or a transformational meeting… but psssst, my lips are sealed ;-)

Have you ever wondered how to manage 120 connected pipelines (or release trains, in software)? That’s the domain of Drum-Buffer-Rope!

This is a very special hands-on package. It contains everything you need to manage production-like flow at scale.

And if you work in agile, this could be your eye-opener. Agile is production, so why not use the best of the best production controls?

It’s hard to believe how Drum-Buffer-Rope works until you’ve seen it. And even when a production line seems simple, it takes a lot of experience to size the protective capacity and manage the constraint.

This simple Excel simulator shows visually what happens in a production line. You can change cycle times and buffers, and even switch between push and Drum-Buffer-Rope.

It’s perfect for learning why OEE is not the KPI that guarantees your success.

“I don’t believe anything,” said the skeptic to the expert – and so the learning journey began.

Are you sure a constraint exists in every environment? Are you sure you know how to prioritize so that the most business value emerges? Do you know how many people you have to move to double the business value? Questions upon questions.

In this package, you’ll find our very old Excel multi-project simulator. We used it to test all our assumptions about Critical Chain Project Management… they all held up, and we learned so much.

I’ve lost count of how often we’ve played Tony Rizzo’s Beads Game with managers at every level. It has so many facets and lets you address every question about constraints, flow, buffer management, and even Throughput Accounting.

This package contains the guidelines, materials, and stories around the Beads Game.

Your key to making TOC stick with top management.