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As of 2026, Highline Beta argues that venture teams often test what's easiest rather than what's riskiest, leading to fast progress in the wrong direction, which is why they developed the Assumption Tracker tool to help innovators identify, prioritize, and test their most critical and uncertain assumptions.
The Assumption Tracker is a collaborative tool that helps venture teams map assumptions by criticality and uncertainty to determine testing priorities. Teams often assume their assumptions are correct without proper research or jump to testing what's easiest rather than what's most critical to their venture's success. The tool uses AI-powered assumption generation and a matrix-based mapping system where assumptions in the top-right quadrant (critical and uncertain) should be tested first, ultimately helping teams de-risk venture development and reach critical learnings faster.
Critical assumptions are those that, if proven false, would cause the entire venture to fail. Uncertain assumptions are beliefs about the venture that teams have little confidence in or lack real-world data to support. The most dangerous assumptions are both critical and uncertain, as they represent the highest risk to venture success and should be prioritized for immediate testing.
The tool includes an AI-powered assumption generator that helps teams identify potential blind spots they might miss during brainstorming sessions. This feature provides inspiration and suggestions to ensure comprehensive assumption mapping, helping teams avoid overlooking critical assumptions that could impact their venture's success. Teams can use this alongside manual assumption writing to create a more complete picture of their venture's underlying beliefs.
According to Highline Beta, teams typically test what's easiest rather than what's riskiest, leading to wasted effort and progress in the wrong direction. Assumption mapping forces teams to break down all moving parts of their idea, build shared language around learning priorities, and design smarter experiments. This systematic approach ensures teams focus on validating the most critical aspects of their ventures rather than pursuing convenient but less impactful tests.
The tool is applicable throughout the entire venture building lifecycle, from discovery through validation to build phases. Teams should conduct assumption mapping sessions at any inflection point where they're unsure what to test next. This approach provides direction and ensures teams remain focused on the most critical learning priorities rather than getting overwhelmed by the ambiguity inherent in venture building.
What:
Today on our HLB Toolkit series we are introducing the Assumption Tracker!
When building ventures it can feel overwhelming dealing with ambiguity, especially when it comes to building confidence in your venture's merit. Our tried and true solution to that is by identifying, prioritizing and testing the underlying assumptions.
Innovators face assumption management at any stage of the venture building process, be it discovery, validation, or build. Assumptions are what we believe to be true about a venture but have yet to be proven through real world data or testing. By identifying your solution’s assumptions and mapping them by criticality (if false, the venture fails) and uncertainty, you gain clarity on what you need to learn and the order in which to conduct tests. Ultimately, this will reduce ambiguity and provide you data on whether your solution has merit.
Through our years of helping innovators write and map assumptions, we’ve learned that it can be an overwhelming and awkward process. That’s why we launched the Assumption Tracker tool. This tool will not only help you identify which critical assumptions to test first, but also help you generate assumptions through the power of AI!
How:
The Assumption Tracker is collaborative and easy to use. This is how we recommend using it:
Why:
Too many teams jump to what is easiest to test, not what’s riskiest to figure out. They also tend to assume that their assumptions are correct without conducting proper research. That’s how you make fast progress in the wrong direction.
The Assumption Tracker tools helps you:
Ultimately, identifying and tracking assumptions ensures you de-risk the development of your venture and get you to critical learnings faster.
When:
The Assumption Tracker tool is applicable throughout the entire lifecycle of the venture building process. At any inflection point where you are unsure what to test next, we recommend conducting an assumption mapping session. Doing so will help provide direction and ensure teams focus on validating or invalidating the most critical aspects of their ideas.
Notes:
The following best practices are recommended when using the tool:
Example:
Let’s revisit our Gen Z financial challenges example to see the Assumption Tracker in action!
Here’s the problem space used as inspiration for assumption mapping:
And here’s the results of an assumption mapping session in the Assumption Tracker:
As you can see, there are a litany of assumptions that were pulled out from the Gen Z finance problem statement. The assumptions in the top right hand corner are the most critical and uncertain assumptions which should be prioritized for further testing.
Export a copy of the assumption map once a session is done to and refer back in subsequent assumption mapping sessions.
Next in our series we will be exploring the Solution Scorecard, a tool to help innovators objectively evaluate the desirability, viability, and feasibility of a proposed venture.
