A dialectical constructivist approach, based on a theory of constructive op
erators (TCO), is presented. This theory explains human psychological funct
ioning as produced by dynamic syntheses of a variety of schemes, the "softw
are," and mental "hardware" operators. In this model the activity of the su
bject is captured by means of such mental operations as allocation of atten
tion to, or interruption of the application of schemes, as well as by execu
tive processing. These all influence the probability of certain schemes bei
ng activated and synthesized in a field of internal complexity. Using this
theory as a base, the process of meaning construction in therapy is describ
ed as a dialectical synthesis between two major types of processing, concep
tual and experiential. These act together to constantly generate explanatio
ns of experience. Three important moments in the construction process, emot
ional arousal, symbolization, and reflection are discussed. Finally a thera
py transcript is analyzed in terms of the TCO to illustrate the dynamic syn
theses and mental operations involved in generating meaning in therapy.