Signals & Levers

Systems Thinking Tools to Unblock Software Delivery

Foreword by Gene Kim
Published by IT Revolution
Distributed by Simon & Schuster
LIST PRICE $32.00

About The Book

Stop fighting symptoms. Start finding solutions. Discover the systems thinking tools that actually work.

In Signals & Levers, Elisabeth Hendrickson—former VP R&D at Pivotal and author of the enduring Explore It!—and Joel Tosi—who has spent 25+ years delivering software and a decade helping teams stop “change theater”—teach you to see through the illusions that plague every software organization. Using tools from statistical process control, systems thinking, and economic theory, they show you how to identify real problems and find the levers that create lasting change.

Each chapter delivers practical techniques. Learn to spot critical illusions that derail delivery, build causal diagrams that reveal system dynamics, and uncover hidden connections that make obvious solutions backfire. See how to separate signal from noise, frame problems as testable hypotheses, visualize trade-offs as continuums, build cultures that learn instead of repeating mistakes, and ultimately choose the right path forward given your context. Plus, “Better in 30 Minutes” exercises let you practice immediately.

Along the way, you’ll meet Theresa, an engineering director. She learned that her teams are late delivering the next release. Again. Frustrated, she digs into the data only to discover that she’s been suffering from illusions that readers will find all too familiar. You’ll follow Theresa's journey as she learns to read signals and find the right levers to fix systemic issues.

Whether you're a developer tired of death marches, a CTO struggling with predictability, or a PM wondering why everything takes longer than planned, this book provides the systems thinking skills that transform software organizations.

About The Authors

Elisabeth Hendrickson is a technology leader with 30+ years experience and a track record for building highly effective leadership teams. She led a geographically distributed organization with ~170 engineers, product managers, and designers as a VP R&D at Pivotal, a publicly traded company. She has also been a VP engineering at a series B startup, and has held various other technical leadership roles in addition to hands-on-the-keyboard roles as a programmer and tester.

Her book Explore It! from Pragmatic Bookshelf remains popular over a decade after publication. These days she works with technology leaders to improve collaboration, decision making, and execution.

Joel Tosi has been delivering software products for over 25 years. Along the way, he has felt frustrations that he couldn’t express effectively; managed teams where he could see the problems they were experiencing, but couldn’t get peers to see it the same way; and seen far too many good intentions end with less than desirable results. Joel has stories.

For the past decade, Joel has focused on helping make it easier for teams to enjoy their work and innovate. This has led him to need to find new ways to express what is holding teams back so everyone could see the same reality. Frequently what is holding teams back is the network effect inside of an organization - the system reacting. Blindly following processes never solves this.

Joel started leveraging the techniques in this book to help teams tell their story at first, then to educate managers and executives on the techniques in this book so they could make better decisions together. Ultimately it is about stopping change theater.

Joel has been presenting the concepts in this book internationally for over 5 years and continues to explore new ways to leverage these techniques to help make work more enjoyable. The joy when people say “now others can see what I have been feeling” is a wonderful feeling.

Product Details

  • Publisher: IT Revolution (September 22, 2026)
  • Length: 368 pages
  • ISBN13: 9781966280293

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Raves and Reviews

“Signals and Levers is already, right there in the title, an incredibly useful idea for our field. When I started into reading this book, my expectations were already high, what with this incredible author team, their systems-informed focus, and this title. But the novel approach to unfolding and contextualizing insights and leading us through systems-informed practices for leading organizations, was a lovely surprise! My initial ‘I am so excited for our field’ only deepened as I read further! This is, in a sense, an observability practice book for organizations, where we use systems tools to understand and make visible, so that we can learn and respond more effectively to the forces shaping outcomes.”

– Ruth Malan, creator of Adventures in System Seeing

“I have no doubt that Signals and Levers will be considered the definitive entry point into this fantastic body of knowledge.” 

 

– Gene Kim, WSJ bestselling author of Vibe Coding, The Phoenix Project, and Wiring the Winning Organization

“We have long known that systems thinking is the key to solving complex problems, yet its practical application has remained elusive. As AI’s impact grows rapidly, the need for this book is more urgent than ever. It transforms an abstract discipline into a powerful toolkit for anyone building today. A must read.”

 

– David Anderson, architect and author of The Value Flywheel Effect

“After a career spent in tech, wondering why all those dumb things keep happening, Signals and Levers comes along and explains what systems theory is, how it works, and how to apply it. Instead of a simple transactional system of ‘X input delivers Y output,’ this book has helped me understand that complex systems just don’t work that way. Instead, by making structured observations of a system’s signals, one can identify the levers available—the things one can change. And most importantly, the book helps interpret the new signals resulting from the levers pulled. I’ve been using what I learned to understand metabolic changes, political situations, and, of course, why things go crazy in a software factory. The analogies are clear, the illustrations charming, and the end-to-end example visited in each chapter makes it all easy to understand and apply.

 

– Mysti Berry, Principal Technical Writer, (alum Salesforce, Crowdstrike)

"This book brilliantly teaches you to see structures and relationships, expose and understand the true constraints, and discover leverage points that allow you to steer toward better. Elisabeth and Joel provide an important warning: ‘Once you learn to see, you won’t be able to unsee.’”

 

– Chris Pipito, CEO & Principal Consultant, Agileworks, LLC

“Reading this book can take people into their past, present, and a better future.”

 

– Pradeep Soundararajan, CEO, Moolya & Bugasura

“Programmers are rarely taught how to think about complex systems in a systematic way. This book offers tools for doing that—for distinguishing signal from noise, for identifying feedback loops, and most importantly, for communicating with colleagues more effectively.”

 

– Greg Wilson, Third Bit

“Our dashboards excel at showing change but leave it to us to identify anomalies. We draw flowcharts and label the boxes but not the arrows. It’s refreshing to read a book that frames system state as the product of decisions that compound over time and gives teams practical tools to make sense of them.”

 

– Noah Sussman, Product Infrastructure Lead, Tassat

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