All user actions must be reacted to in some way. Feedback, as has been noted, shapes human performance. Without it, people cannot learn. To aid user learning and avoid frustration, it is also important to provide thorough and timely guidance and assistance. In this step, the following feedback topics are discussed:
This will be followed by a review of guidance and assistance, including
To be effective, feedback to the user for an action must occur within certain time limits. It is known that excessive delays can be annoying, interrupt concentration, cause the user concern, and impair productivity as one's memory limitations begin to be tested. What the ideal system response time is has been the subject of numerous studies for decades. The following general guidelines were derived through research using text-based and graphical systems. After this research is surveyed, the expanding body of knowledge regarding response time delays in Web-based systems will be reviewed.