One button made the choice obvious
A mouse button is more than a switch: it is a choice the user must understand before clicking. With several buttons, a newcomer has to learn which one selects, which one opens something, and whether the answer changes from one screen to the next. Early testers’ confusion made that extra decision a real obstacle, not just a matter of taste.
Steve Jobs pushed for a single button. The design made the physical action consistent: point at something, then click. It could not offer several commands directly from the mouse, but it reduced the number of controls a beginner had to interpret.
Put complexity on the screen
The tradeoff was to make the computer’s interface explain more of what to do. Instead of asking users to remember a different mouse button for each task, a graphical interface could present commands in menus and show objects that could be selected on screen. The mouse supplied a simple, repeatable action; the software determined what that action meant in context.
That division shaped the experience: fewer choices in the hand, with more guidance in the interface. A one-button mouse was not capable of as many direct inputs as a multi-button device, but its limitation helped make the first interaction easier to grasp. The design’s lasting lesson is that simplicity often comes from deciding where complexity belongs—not eliminating it altogether.
