Validating

Problem interviews, smoke tests, competition: before a line of code is written.

How to Validate a Business Idea Before You Build ItHow to validate a business idea: write down the assumptions that can kill it, run 20 to 30 interviews, test willingness to pay and set kill criteria first.
Customer Discovery Interview Questions That WorkCustomer discovery interview questions should ask about past behaviour, not opinions. A 16-question script, rewrites for weak questions and a scoring sheet.
Smoke Test Landing Page: Measure Demand Before BuildingA smoke test landing page sells a product that does not exist yet. How to build one, how many visitors you need and how to set a pass mark from your numbers.
How to Calculate TAM, SAM and SOM (Bottom-Up)How to calculate TAM, SAM and SOM from the bottom up: customers times price. Worked example with official UK business counts and a sales-capacity sanity check.