The repertory grid is an interviewing technique which uses nonparametric factor analysis to determine an idiographic measure of personality.
In practice, good grid interview technique would delve a little deeper and identify some more behaviorally explicit description of "tense versus relaxed".
The richness of people's meaning structures comes from the many different ways in which a limited number of constructs can be applied to individual elements.
A person may indicate that Tom is fairly keen, very experienced, lacks social skills, is a good technical supervisor, can be trusted to follow complex instructions accurately, has no sense of humour, will always return a favour but only sometimes help his co-workers, while Mary is very keen, fairly experienced, has good social and technical supervisory skills, needs complex instructions explained to her, appreciates a joke, always returns favours, and is very helpful to her co-workers: these are two very different and complex pictures, using just 8 constructs about a person's co-workers.
The repertory grid is emphatically not a standardized "psychological test"; it is an exercise in the mutual negotiation of a person's meanings.