Registration will give you access to additional features not available to guest users, including access to simulation/modeling tools, the ability to ask questions, create private groups, participate in discussions, rate resources, and more. The registration process is completely automatic and it takes just a few minutes. Your registration also helps us sustain this project. Our funding agency periodically reviews statistics about the number of users that access our site. By registering and filling in your personal profile, you are helping to justify our existence and continue our funding.