Documentation testing Testing the quality of the documentation, e.g. user guide or installation guide. Domain: The set from which valid input and/or output values can be selected. E Efficiency: The capability of the software product to provide appropriate performance, relative to the amount of resources used understated conditions [ISO/IEC 25000]. Elicitation:The act of obtaining information from other people. In the context of Requirements Engineering, elicitation is the process of gathering requirements from stakeholders.