From its early years, when it was contending that the Nairs needed to join together if they were to become a political force, it argued that the caste members should cease referring to their traditional subdivisions and instead see themselves as a whole. Census information thereafter appears to have become unreliable on the matter of the subdivisions, in part at least because of the NSS campaign to ensure that respondents did not provide the information requested of them. The NSS also promoted marriage across the various divisions in a further attempt to promote caste cohesion, although in this instance it met with only limited success. Indeed, even in the 1970s it was likely that cross-subdivision marriage was rare generally, and this was certainly the case in the Central Travancore area.