This design experiment in prayer education for Jewish students was motivated by a current educational concern: educating for spirituality and religious practice. Educators are tasked with formally nurturing spirituality (Wright 2001). It is known that attitude to religious observance may change during adolescence (Hyde 1963), thus attitude to prayer needs attention. The effects/consequences of prayer understanding reach beyond religious practice itself, to encompass issues of faith, identity, spiritual development and well-being (Sigel 2009). Here quantitative and qualitative analysis is used to measure the effects of a tefillah (prayer and its understanding) course on student attitudes to prayer.