I have found customer discovery section of Steve Blank's Four Steps book and Business Model canvas from Business Model Generation book to be very invaluable too

I have found customer discovery section of Steve Blank's Four Steps book and Business Model canvas from Business Model Generation book to be very invaluable tools for evaluating new ideas whether my own or of other new potential entrepreneurs. I actually converted customer discovery section into one pagers like canvas. It allows me to quickly go through evaluating any new idea, document different aspects, and identify holes in my understanding and where to focus. none of the stuff listed is unique but it provides a easy step by step actionable structure. I find just documenting business model canvas, product and customer hypotheses enough to figure out potential and challenges involved in pursuing an idea.