This document provides design tips for complex forms based on principles of usability. It discusses how complexity can affect a form's appearance, the conversation with the user, and the relationship between the form and the user's goals. Tips include focusing on the user's needs, putting the first task first, using consistent language, providing just enough help where needed, and placing buttons in alignment with text boxes for optimal visibility. Complex forms require consideration of all three layers - appearance, conversation, and relationship - to ensure the user can successfully complete the important task.