I've found Hanno's Lean Validation Playbook very useful in the past: https://www.smashingmagazine.com/2016/07/a-lean-approach-to-product-validation/ https://www

I've found Hanno's Lean Validation Playbook very useful in the past: https://www.smashingmagazine.com/2016/07/a-lean-approach-to-product-validation/ https://www.smashingmagazine.com/2016/07/a-lean-approach-to-...