What characteristics of crowdfunding platforms influence the success rate?

Crowdfunding platforms are emerging all over the world offering their services as neutral facilitators to crowdfunding projects. A high success rate reasonably can be assumed as favorable for both the platforms and the project owners. But large differences can be noticed between platforms and their success rates. How is this constituted? In a quantitative analysis with data gathered from content analyses and a survey this master thesis aims to find those determinants that influence this success rate.