If you give people a sense of control they're happier with their decisions

It is not only humans who like to choose: animals prefer to have a choice as well. In fact, they choose to choose even if having a choice does not change the outcome. If rats need to select between two paths that lead to food - one path is a straight line and the other subsequently requires them to select whether to go right or left - they choose the latter path. Pigeons do the same thing. Give a pigeon two options: the first is a button to peck that results in grain being dispensed, and the second is two buttons from which it needs to select one to peck in order to receive the same grain, and the bird will pick the option with two buttons. The pigeons quickly learn that the seeds are no different; yet they prefer the seeds that were obtained by making a choice.

Button A gives grain.

Button B leads to two more buttons. Either one gives the same grain.

The pigeon chooses B.

From a purely functional view, the bird has selected extra admin. Yet the experiment suggests that choosing can affect the experience even when it leaves the material result unchanged.

A product team hears this and builds twenty selectors. The customer chooses an icon colour, greeting style and animation speed, then discovers they cannot alter the delivery date or cancel online. This is agency as confetti: lots of visible decisions around details the seller does not care about, none where the customer does.

The opposite design supplies a sensible default and two choices with consequences. Morning or evening delivery. Monthly or annual commitment. Each option states what will differ. People who care can choose; everyone else can continue.

Choice also changes blame. Select the evening slot and a late delivery can feel partly like your decision gone wrong. Receive an assigned slot and the same delay belongs entirely to the seller. That may improve satisfaction figures without improving punctuality, a temptation worth noticing.

There is no universal number of options. Choosing a paint colour may be the pleasure of the purchase. Choosing among twelve consent boxes is unpaid compliance work. The test is embarrassingly ordinary: did the person influence something they value?

In a usability session, one participant spends four minutes selecting colours. Another accepts every default. Both ask why the cancellation date is fixed. The facilitator then moves to the next task.