 A central task in Isotype was the “transformation” of complex source information into a sketch for a self-explanatory chart.The principal “transformer” from the beginning was Marie Reidemeister (who became Marie Neurath in 1941).A defining project of the first phase of Isotype (then still known as the Vienna Method) was the monumental collection of 100 statistical charts, "Gesellschaft und Wirtschaft" (1930).