Abstract
One hundred and eleven Japanese female college students filled out questionnaires of crowding, in which each subject guessed in 12 pairs of situations with how many partners a fictitious person whose sex and age were supposed to be identical to each subject was considered to be able to share a room without feeling uncomfortable. Smaller numbers of partners meant the subject was more liable to experience crowding. Territoriality orientation, privacy orientation and locus of control were also measured by other questionnaires. Supporting three hypotheses, results indicated that those who have strong territoriality orientation, high privacy orientation or external control were more prone to experience crowding than their counterparts.