lawrence perlman was briefly involved in the original study as a young postgraduate.e few researchers who have spoken publicly about their experiences. ijoined the study in 1968. i was 24. myjob was to organise the data and there was a wealth of data. so the idea was to try to tease out what differences there might be as a result of the different families that they were raised in. thus, be able to understand the relative contribution of hereditary versus environment. part of what we did during the time i was on the study, which was maybe ten months, was to go and visit the twins and i would test the child and do some film samples of them. they would give me these exams, these tests and would be - filming them and i think i felt very anxious when they- would come to the house. and there were many, many different tests given to them. intelligence, personality, emotionality. they were filmed, they were photographed, they were observed. the reason it was done was because the researchers felt the previous twins raised apart studies looked retrospectively at development and