The ITER Threshold Database which presently includes data from 9 divertor tokamaks is described. The main results are presented and discussed. The features and dependencies of the power threslwld in single devices are reviewed. In particular, the analysis shows a rather general linear dependence on magnetic field, but a non monotonic density dependence which varies from device to device. Investigation of the combined database suggests that the threshold dependence Pthres ≈ 0.3NELxBTx R2.5 gives the best agreement with the data. This expression yields Pthres ≈ 150 MW at a density of 0.5 1020 m-3 for ITER. Other expressions with weaker size dependence and therefore lower threshold power for ITER are also discussed. In addition the database is investigated by statistical discriminant analysis. The presently included edge data are described and discussed. A discussion with respect to ITER concludes this work.