> Update: Read more about this in this article I read the article (TL;DR it describes a bond car that lets Bond select a weapon only to then give him an error

> Update: Read more about this in this article I read the article (TL;DR it describes a bond car that lets Bond select a weapon only to then give him an error message saying 'ammunition not loaded', and then considers how this should be handled from a UI perspective). Thinking about the overall UI guidelines topic, the bond article misses an obvious point - that cars already have familiar mechanisms for displaying the status of consumables such as fuel, oil and battery: gauges on the dashboard. Applying the consistency guideline, Q could have installed an ammo gauge, and the 'backfire' button would then be permanently available. After all, Bond might still wish to deploy the gun for effect, e.g. to intimidate someone, even if he knows that there isn't in fact any ammo.