Goodness of fit refers to the extent to which two (2) things are suited. For instance, with respect to child psychopathology, one might use the term to refer to the extent to which the child’s early temperament and the parent’s style of interaction are suited to each other.
Goodness of fit is likewise, the agreement between the parents' expectations of or demands on the child and the child's temperamental characteristics; accommodation of parenting styles to children’s temperaments.