A prompt is a cue that is used to encourage a desired response from an individual. Prompts are often categorized into a prompt hierarchy from most intrusive to least intrusive, although there is some controversy about what is considered most intrusive, those that are physically intrusive or those that are hardest prompt to fade (e.g., verbal). In order to minimize errors and ensure a high level of success during learning, prompts are given in a most-to-least sequence and faded systematically. During this process, prompts are faded quickly as possible so that the learner does not come to depend on them and eventually behaves appropriately without prompting.