Significant time-space clustering of suicide occurs & seems to be mainly a phenomenon of youth. Field studies are attempting to identify mechanisms of clusters & initiating processes. Some are: host traits that increase susceptibility to contagion; occurrence in age groups, locations, or times; duration of the “contagious” period & the most influential characteristics of “model” suicides. Methods such as anecdotal case studies, psychological autopsies & time-space cluster analyses are reviewed.