I am going to test a new product idea that I have. It is a side project, that is going to generate some passive income for me. I don’t have too much time to spend on creating the product. Lean startup techniques are awesome in the sense that they encourage you to ‘get out of the building’ and talk to real customers, but I am not quite ready to do even that. If you are, or have been, in my shoes, you’ll know what I mean. So here are four techniques that I use to test my ideas.