Build your brochure, product spec or sales sheet when you have a clear idea of the solution you intend to offer. Clearly the solution will evolve as you get more feedback from users but you need to have a product to summarize in the document in order for it to be useful as a Solution Validation tool.

Brochures and sales sheets give potential users a stimulus to assess and react to. They give users clearly outlined features, services and solution proposals to connect with and respond to with feedback.

You can always create and print your own brochure in Word, or make a scrappy prototype by hand if you're more focused on content than presentation, but there are online tools that can help too. Check out Canva, Adobe Spark, Vistaprint or Befunky for builders and inspiration.