When I design an interactive design software, I consider visual simplicity, the relationship between elements, and user comfort in accordance with the Gestalt Principle. These are the “Law of Similarity”, the “Law of Simplicity” and the “Law of Common Fate”. For example, the button icons should be consistent with the overall color scheme and style of the software, simple and clear in design, avoid unnecessary complexity, and use dynamic relationships in use, which can connect the function with the user’s actions, for example, when the mouse or touch screen is moved left and right, the menu will also move. In Fitts’s Law, I will consider making the interactive elements large enough to be easier for the user to click on the touch screen. Placing important functions such as “enter” and “back” at the edges of the screen makes them more noticeable to the user. And avoiding small, closely spaced clickable areas can prevent frequent user mis-taps and lead to a lower user experience. I think these are the Gestalt Principles and Fitts’s Law that I would consider when designing an interactive software.