This research paper analyzes and recommends a Question & Answer site for programmers, Stack Overflow, that dramatically improves on the utility and performance of Q&A systems for technical domains. It would be very difficult to analyze the real-time data collected by the users by using traditional techniques. Using a mixed methods approach that combines statistical data analysis with user interviews, we seek to understand this success. Our main focus is to develop a system that provides recommendations and statistical analysis on the basis of data of thousands of users.