“…Quantitative outcome studies of parent–infant psychotherapy have been numerous (Cohen, Lojkasek, Muir, Muir, & Parker, ; Cooper, Murray, Wilson, & Romaniuk, ; Hayes, Matthews, Copley, & Welsh, ; Letourneau et al., ; Murray, Cooper, Wilson, & Romaniuk, ; Ravn et al., ; Robert‐Tissot et al., ; Santelices et al., ; Winberg Salomonsson et al., , ). Another way of investigating the development of the relationship between mother and child is the single case study of therapy cases (Baradon, Biseo, Broughton, James, & Joyce, ; Belt et al., ; Downing, Burgin, Reck, & Ziegenhain, ; Kächele, Schachter, & Thomä, ; Keren, ; Tuters, Doulis, & Yabsley, ; Willemsen, Della Rosa, & Kegerreis, ). Studies applying a qualitative analysis of interview transcripts have become more common (Levitt, ), and some studies used such methods to investigate changes due to therapy (Paris, Spielman, & Bolton, ).…”