Effectiveness of creativity trainings - a meta-analytic approach

The article deals with the problem of creativity trainings effectiveness. Inspiring by Leritz, Scott and Mumford (2005) analysis authors conducted metaanalysis to evaluate the scope of overall effectiveness of Polish creativity trainings. More than forty separate studies were chosen (44) conducted by 17 researchers on large sample of 2142 participants. To evaluate the effectiveness Glass Delta was used as a effect size measure. Analyses show that generally creativity trainings are very effective (delta more than 1), but the effectiveness is highly depending on such elements as: detailed training program, criterion measure, and others. Consequences of the results are discussed.