Market Sizing Guesstimate: Hands-on Activity with Asst. VP – PM

Welcome to the realm of market research and sizing, crucial skills that product managers and business strategists need to master in today’s data-driven environment. IDFC FIRST Bank offers hands-on market sizing insights and ‘guesstimate’ skills. Satyaki Banerjee, AVP of Product Management at IDFC FIRST Bank, leads a masterclass on market research. Let’s explore the vital insights from this session and how they can bolster your market research abilities.

The Significance of Market Sizing and Guesstimates in Product Management

Market sizing is an indispensable part of market research, offering estimations of the potential of a given market—information that’s vital for strategic decision-making. Guesstimation, on the other hand, infuses estimation with inference and logic, creating a hybrid approach to problem-solving. Masterclass techniques aid product managers in navigating market challenges efficientl

Structural Approach to Guesstimation

Diving into guesstimation demands a structured approach. Banerjee unveils a 10-step process in the masterclass, which is fundamental in dissecting a market sizing problem. Start by clarifying, creating an equation, and breaking down into solvable chunks. This process requires probing for known and unknown variables and look for data points or directions to reach a logical conclusion.

Developing Problem-Solving Skills

The masterclass emphasizes taking time to understand and define problems before rushing to solutions. Mindset aligns with product management, focusing on problem-solving and growth opportunities.

Implementing the Guesstimate Process: An Example

Participants in the masterclass were offered a practical example: estimating the number of daily Google searches worldwide. The exercise walked through defining parameters, considering variables such as global population with internet access, market share, and the frequency of searches. This hands-on activity demonstrated how to convert assumptions into a calculable estimation through the considered dissection of the problem.

Reflection on Market Research Methodologies

The case study approach adopted by IDFC FIRST Bank in the masterclass series illustrates the market research methodology brilliantly. It encapsulates the importance of a robust analytical foundation while carrying out market sizing. Furthermore, it sheds light on the pragmatism needed when dealing with incomplete information, a common scenario in the industry.


Learning market research and sizing through guesstimation techniques enables us to study markets with a critical and analytical perspective. The hands-on activity from the IDFC FIRST Bank Masterclass series underlines that while precision in data is desirable, the ability to make educated assumptions is key. Satyaki Banerjee’s expertise leads us to understand that it’s not just about the numbers—it’s the logic, reasoning, and systematic breakdown of complex problems that drive successful market sizing in product management.

Whether you are a seasoned professional or someone just getting started in the realm of product management, applying these guesstimate principles can significantly impact your ability to strategize and make informed decisions in the banking sector and beyond. As markets continue evolving, the skills taught in this hands-on activity provide a powerful toolkit for any individual aiming to thrive in dynamic market environments. Remember, the essence lies in mastering the art of estimation, and as the IDFC FIRST Bank’s masterclass series shows, with the right guidance, it’s an art that you can indeed learn.

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