The original version of the home page contained a rather abstract account of Estimation and Decision Making. As explained on the new version, the website exists because of a need to explain something which is important for various applications.
This account of Decision Estimation is for realworld applications such as a Justice System. As explained on the website for that specific application, the biggest problem with decision making and estimation is error covariance. Another important application of the material presented below is in bipartite matching. In this case the problem is to estimate the weights applied to each possible connection, so the the resulting solution will be optimal. When is this important? A very specific application is in finding matching pairs of people, to form good interpersonal relationships.