In my understanding, external variables that might influence an individual’s perceived ease of use or perceived usefulness of a new technology include:

– Perceived enjoyment
This refers to a person’s enjoyment or pleasure in using a technology. Higher perceived enjoyment is associated with a more positive perception of ease of use and usefulness of new technologies.

– Job Relevance
This refers to a person’s belief about whether a technology is relevant to their job or task. Higher job relevance is associated with a more positive perception of the usefulness of new technologies

– User Attitudes
This refers to a person’s attitudes towards using a technology. Higher user attitudes are associated with a more positive perception of ease of use and usefulness of new technologies.