The VisitorEngagement Assessment framework uses objective assessment, physiological responses, and estimation models to derive evidence of how a visit is perceived for individuals and groups of subjects. It consists of four layers:

• Layer I: the Scenario Layer presents the artefact, the subject, the action or interaction of the subject, other subjects, and, to some extent, observers;
• Layer II: the Data Collection and Observer Layer describes which data are collected from the elements of the scenario.
• Layer III: the Assessment Layer describes the types of assessment performed;
• Layer IV: the Assessment Process Layer describes how the assessed data are processed further for the evaluated properties.