The Product Opportunity Evaluation Matrix (POEM) is a framework for thinking through the conditions of a market prior to building or launching a product. The matrix can be used to identify strengths and weaknesses in a market opportunity based on five key forces; Customer, Product, Timing, Competition, Finance.
Each force has five generally accepted truths which you'll grade based on your idea. By going through the exercise and scoring each question you'll be required to understand all the dynamics of the market that may impact the success or failure of your product.