Multi-dimensional data analysis tools are applied to Reuven Kahane's data on the informality of youth organizations, yielding a graphic portrayal of Kahane's code of informality. This structure helps address questions of the whether the eight structural components exhaustively cover the field without redundancy. Further, the structure is used to examine changes in Israeli youth movements over two time periods (1925-1960 and 1960-1990). It is found that social aspects of the group have become more important, while ideology (especially socialist ideology) is less emphasized. Directions for continued research among youth movements since 1990 are explored.