In a graphical user interface, having the user move a cursor within a narrow path (e.g., in a hierarchical menu or a slider) follows a strict law for how easy or difficult it is to do, depending on the specifics of the GUI.
Fitts's Law describes how long it takes a user to hit a target in a graphical user interface (GUI) or other design, as a function of size and distance. Understanding this law helps us design better buttons, forms, lists, and other interactive elements.
Human-Centered Design (HCD) is not about following processes. It’s about being mindful of HCD principles. Keep focus on people and the entire system to solve the right problems.
