Kelly and the concept of developmental stages

Although personal construct theory (PCT; Kelly, 1955) shares with developmental-stage theories an emphasis on process and qualitative change, the concept of developmental stages is incompatible with PCT in several ways. Building on biological analogies of maturation and evolution, developmental-stage theories posit an inevitability of content or structure in the occurrence of stages and a directionality of the developmental process toward extraspective (as opposed to introspective) definitions of psychological maturity. PCT, in contrast, lacks these features of inevitability and directionality. Kelly intended an introspective view of development based on personal choice, conceived in psychological rather than biological terms. Implications of the Choice, Fragmentation, Commonality, Dichotomy, Modulation, and Experience Corollaries for the concept of stages are discussed. Kelly's PCT is compared with the theories of Piaget, Kegan, and Erikson to illustrate these points.