(from P39 to P)
* Familiarity * Simplicity: thinking about the typical streamline of a task. * Availability: avoid hiding key features and settings too deeply in submenus or making them accessible only from a contextual menu (which is not always able to be triggered) * Discoverability: Encourage users to discover functionality by providing cues. If an element is clickable, for example, it must appear that way. Avoid making controls invisible to inexperienced users.