Our research shows that estimates generated from state-of-the-art estimation tools are no better than estimates based onjudgment and pure "gut-feeling". The idea behind EstimationWeb is that judgment-based estimation can be substantially improved with tool support. We plan to implement tools that cover all phases of the estimation process. EstimationWeb will support experts in a) preparing the input material for the estimation, b) performing group-based estimation, c) quantifying estimation uncertainty, and d) benefitting from experience databases. We will implement the tools as a modem, service-oriented web application, called EstimationWeb, to enable easy and flexible integration with commonly used software tools for planning and budgeting. Each tool can be used independently, but we expect best results when the tools are used in combination.