As with Equation 12 for the second stage moderation model, Equation 22 shows that the second stage of the indirect effect of X on Y depends on Z, as indicated by the term aX3(bM20 bMZ20 Z). However, Equation 22 adds moderation of the direct effect of X on Y, as captured by the term (bX20bXZ20Z). The intercept in Equation 22 also varies across levels of Z because of the terms bZ20 Z and bMZ20 Z.