You have your concepts in place, you understand the value and where in the market it fits, but what does that market look like?  Is it red-ocean, blue-ocean?  What is the competitive landscape and the overall value of the market you are looking to compete in?  These are the questions answered by the Market Assessment.
ICatalyst will create a report after going through the process of:

Understanding your offering
Researching the direct and secondary markets related to your offering
Conduct a gap analysis of the market based on expectations
Identify and assess competitors or likely competitors in the space
Performing a risk analysis on the competitive landscape