如何获得自定义开发项目的最终用户（客户端）反馈

My company is a custom development shop for a number of projects, some larger and some smaller. Currently we handle all of our client communication through email. So we email a design doc, they mark it up and send it back. Then we roll out a beta version of their product and they email us with any bugs, new features, etc. And so on....My company is a custom development shop for a n