Interviews are useful for familiarizing yourself with the visual and temperamental aspects of different types. Notice John’s facial expressions, eye movements, posture, mannerisms, speech patterns, and responses to others. Over time, you will recognize similar patterns in other ISTJs.
Although not as immediately apparent as in interviews, a person’s type shines through in the work they create as well. Notice the themes, content, and approach John uses in his YouTube videos. What light can this shed on the mind of ISTJs in general?