Indicators
There are many possible measures, but some are not convincing enough, while others may be tangential to the purpose of measurement. The digital domain can be a challenging area in which to find suitable indicators. Impact indicators generally should focus on showing a change for those in the community that the resource serves. Change can be on many dimensions, usually defined as behavioural, knowledge based, competence based or attitudes. If people do things differently, if they know more, are better able to do something, or if they think or feel differently about it, then the impact can be claimed.
See also SMART indicators.