As different competencies or professional backgrounds may affect the quality of program implementation, staffing is a critical issue in home visiting. In this study, N = 430 women received home visits delivered either by a tandem of a midwife and a social worker or by only one home visitor (primarily midwives, continuous model). The groups were compared in a quasi-experimental design on level of participation, implementation of the contents, and clients' responsiveness during pregnancy and child's first year of life. Trends towards a higher dropout rate and lower ratings of the helping relationship indicate an increased challenge to retain a strong working alliance in the tandem model. This is attributable to a stronger orientation towards the participants' interest in the continuous model, whereas treatment fidelity in the tandem model is higher. Recommendations to improve the helping relationship in the tandem model are given. (Contains 5 tables.)