This session will focus on the importance of Graphical User Interface Design (GUI) in 4D v11 SQL applications. In most instances users experience the technical innovations in your code by interacting with the interface. Moreover, anyone involved in the decision-making process may only have time and be interested in experiencing your product at the GUI level. First impressions are extremely important. Just like when someone meets you for the first time and that person forms an opinion of you based on your appearance, your body language, your demeanor, etc., users will also evaluate your application by its GUI. These first impressions are difficult to reverse or undo, making the first encounter a pivotal event. We will discuss some principles and strategies to maximize the opportunity to create a flawless and lasting impression of your application. In addition, beyond the initial reaction, the effectiveness and productivity of the tool you have created is closely related to its GUI.