Signals & Levers: Systems Thinking Tools to Unblock Software Delivery

Elisabeth Hendrickson and Joel Tosi open by explaining why systems thinking is having a moment right now: organizations that went all-in on Agile and DevOps are finding those returns plateauing, and the rise of AI is forcing engineering teams to reexamine where their real bottlenecks are. The book, Signals & Levers, gives software engineers a practical vocabulary and toolkit for that examination. A core insight is that most organizational dysfunction isn't caused by bad people or bad intentions, but by systems that produce bad outcomes predictably and structurally. The named archetypes in the book — over 20 of them, covering patterns like escalating technical debt, the "fixes that fail" loop, and the boiling frog — give teams a shared language to recognize and reason about those patterns without having to discover them from scratch.

The most practically actionable section of the conversation covers signals versus levers: understanding the difference between information (a signal) and an intervention point (a lever) is the foundation for making changes that actually work rather than changes that feel productive and achieve nothing. On AI, both authors are cautious in the right ways: Elisabeth uses it daily as a thinking partner but keeps herself firmly at the steering wheel. Joel's warning is starker — AI amplifies whatever is already true about your organization, including dysfunction, and if it lets you ship faster than you can learn, the consequences may be severe. The book closes with an exercise for the reader: if AI doubles your delivery speed, what happens when you can ship faster than you can adapt?