As part of the intramural NIMH study of typical development and childhood-onset schizophrenia (COS), 525 high-resolution magnetic resonance imaging scans were acquired on 208 subjects, 102 with COS. For each scan, thickness was estimated at ~80,000 cortical vertices via MNI’s CIVET pipeline, and penalized splines were used to estimate maturational trajectories (thickness as a function of age). Using only healthy subjects, developmental modules were derived by clustering vertices with similarly shaped maturational trajectories. Using both healthy subjects and subjects with COS, schizophrenia-related alterations in cortical maturation were tested for all cortical vertices. Finally, it was determined whether schizophrenia-related alterations in maturational trajectories were influenced by the organization of normative developmental modules.