Model. A model is a manipulable spreadsheet based on an in-depth methodology and proprietary and industry data. Models contain clearly laid-out inputs, calculations, and outputs. Forecast. A forecast is a spreadsheet that provides forward-looking data, typically three to five years ahead, to determine the prospects and impact of a technology trend or important new innovation. The Forrester Wave™. The Forrester Wave is an interactive research graphic that illustrates Forrester's call on emerging technology markets. It evaluates the strength of a company's current offering, its strategy, and its market presence with an open methodology and a straightforward algorithm that exposes vendor scores, key attributes, and weightings in an interactive spreadsheet available to both vendors and clients.