Repertory Grid Technique

I didn't know about the grid technique and interpretive way of construct a social group. Now, i can assume myself I construct the group which was based on my characteristic. In classes I am always like to discuss with enjoyment, open minded relationship, sharing with each other but other construct I saw discussion with carefully, no sharing, no joking that was difference construct. I think difference may be due to people being rated and made group through prereflective way. According to Butt it's difficult  to construct initially by using rating rather it could be made by prereflective mechanism.