Study the people behind the ICO, team members must display expertise in their respective roles and have proven track records and experience in the industry that they seek to disrupt. Evaluate the technology. Proofs of concept are  critical in showcasing that these ventures know what they are doing therefore you should check to see if the ICO has an MVP or Beta project or an existing and fully functioning product. Instoken is an ICO designed to power the global services marketplace. Check out Instoken's website http://instoken.io.