The success of any software project starts with a sound plan. The software industry has a long history of late delivery and overspent projects. Interestingly enough, very few companies keep this history in a retrievable form. As a result, each project starts without the learnings of the previous. This presentation will first outline the benefit of having history information available for project estimation, describe the inherent complexity of estimating medium to large software projects and then demonstrate a tool that assists in developing estimates. At the conclusion of this presentation, the attendees will discover that software projects are really similar in nature and that a little math with some industry history information can go a long way to developing credible defensible estimates.