In place of Karo's three standard authorities, Isserles cites "the later authorities" (chiefly based on the works of Yaakov Moelin, Israel Isserlein and Israel Bruna, together with the Franco-German Tosafists) as criteria of opinion. While the "Rosh" on many occasions based his decision on these sources, Isserles gave them more prominence in developing practical legal rulings. By incorporating these other opinions, Isserles actually addressed some major criticisms regarding what many viewed as the arbitrary selection of the three authorities upon whose opinions Karo based his work.