P - weakness - first of its kind and took in a different period of time.
E - Asch results are unique because research took place in a particular time of the US history when conformity was high. In 1950s the US was in grip of McCarthyism
E - TMB, during this period anti-communist period when psople where scared to go against majority and most likely to conform. Therefore, this may have been reflected in Asch study as people might have conformed out of fear.
L - therefore finding cannot be generalised to now and therefore findings lack temporal validity.