In 1973, 1983, and 1993, individual rabbis and professors issued six major opinions which influenced change in the Conservative approach, the first and second Sigal, Blumenthal, Rabinowitz, and Roth responsa, and the Hauptman article. These opinions sought to provide for a wholesale shift in women's public roles through a single, comprehensive legal justification. Most such opinions based their positions on an argument that Jewish women always were, or have become, legally obligated to perform the same "mitzvot" as men and to do so in the same manner.