The assessments in TerraNova, The Second Edition were scaled and calibrated using Item Response Theory (IRT) procedures matching those followed in the development of TerraNova CTBS. The new assessments share the same scale as the first TerraNova series.
The new TerraNova Multiple Assessments, Complete Battery, and Survey are closely matched to each other and to TerraNova CTBS in terms of content, difficulty, standard error functions, floors and ceilings, and other psychometric properties. Extensive quality control procedures were used to ensure that calibration results are accurate.