Market sizing is often treated as a box to tick, but when done well, it can be one of the most powerful inputs into B2B GTM strategy. When done poorly, it becomes a rabbit hole that eats time without changing a single decision. In this session, you’ll learn how to use market sizing with intent, focusing only on the inputs that drive prioritisation, investment decisions, and GTM focus. The emphasis is on speed and usefulness, not perfect numbers or exhaustive models. We’ll cover how to choose the right sizing lens for the decision you’re making, avoid unnecessary depth, and turn sizing outputs directly into actions like account segmentation, prioritisation, and value modelling. Key takeaways - How to use market sizing to inform real GTM decisions, not just create slides - When to use different sizing approaches depending on the question you’re trying to answer - How to avoid over-investing time in sizing work that won’t change outcomes - Practical ways to turn sizing insights into segmentation, prioritisation, and value models