 Numeraries, the second largest type of members of Opus Dei, comprise about 20% of total membership.Numeraries are celibate members who give themselves in "full availability" (plena disponibilitas) for the official undertakings of the Prelature.This includes full availability for giving doctrinal and ascetical formation to other members, for staffing the internal government of Opus Dei if asked by the regional directors, and for moving to other countries to start or help with apostolic activities if asked by the Prelate.