Work-family research emphasizes the importance of mechanisms that link work and family. However, these mechanisms typically are described in metaphoric terms poorly suited to rigorous research. In this article we translate work-family linking mechanisms into causal relationships between work and family constructs. For each relationship we explain its sign and causal structure and how it is influenced by personal intent. We show how these respecified linking mechanisms constitute theoretical building blocks for developing comprehensive models of the work-family interface.