Differentiatie, doorstroming en sociaal milieu in het lager technisch onderwijs 1974

School career: repeating classes, education after primary school, differentiation at technical school / occupation of father kind of industry, concern, etc., position. Background variables: basic characteristics

学业历程：留级经历、小学后教育阶段情况、技术学校分流情况；父亲的职业、所属行业、相关关注点及职位信息等。背景变量：基础特征。