Roger Bruning will describe an online system, ThinkAboutIt (TAI) that gives learners opportunities to make and justify decisions about content, compare these decisions to those of others, and access experts’ judgments. TAI has been used in a variety of contexts, including judging quality of children’s writing samples (elementary‐level literacy education students), value of differing testing and measurement strategies (teachers), utility of NOAA and other weather products for farming decisions (farmers), and effectiveness of medical case presentations (medical students). The presentation and discussion will focus on TAI’s general design features, their ties to cognitive and motivational theory, and how these features can be incorporated in online and classroom instruction