A "how-to" guide on creating successful websites or Apps. The three elements are (1) Design for User Tasks (2) Design for Flexibility (3) Design for Measurement. The presentation introduces numerous practical methodologies, e.g., The Application Mountain, The Water Mill Development Model, Onion Governance, and the User Task Matrix. Practical examples are taken from work at Scandinavian Airlines, Tryg Insurance, and Maersk.