1. A modeling tool for determining the impact that a data warehouse solution will have upon a business organization considering implementing said data warehouse solution, said modeling tool comprising: a server computer including: at least one business impact model comprising a mathematical representation of a data warehouse solution, said business impact model including an assessment questionnaire, said assessment questionnaire including a plurality of questions relating to said business organization considering implementing said data warehouse solution; and a business impact modeling application for calculating a value of said data warehouse solution to said business organization from said business impact model and answers provided to said assessment questions; a client computer electronically connectable to said server computer for receiving a copy of said at least one business impact model, said client computer providing offline collection of answers to said assessment questions and offline calculation of said value of said data warehouse solution to said business organization from said copy of said business impact model and answers provided to said assessment questions; and an application residing on said server computer for keeping a record of copies of said at least one business impact model received by said client computer.