The WHO Working Group on Injury Surveillance Methods (WGISM) tested a draft of the International Classification of External Causes of Injury (ICECI) during 1999. This report describes the outcome of one part of this project, i.e. the testing of 100 case scenarios. The purpose of the case scenario testing was to provide initial evidence of the performance of the draft ICECI. The report includes description of the the methods used to conduct the study and to analyse the results.