Theory and Applications of Categories (ISSN 1201 - 561X) is the all-electronic, refereed journal on Category Theory, categorical methods and their applications in the mathematical sciences. The editorial policy of the journal provides details.The Editorial Board controls the journal with coordination by its Managing Editor Robert Rosebrugh, Associate Managing Editor Michael Barr, and Steering Committee. Electronic archives are maintained by the journal and at various mirror sites.

類別的理論和應用（ISSN 1201 - 561X）是關于類別理論，分類方法及其在數學科學中的應用的全電子，評論期刊。 該期刊的編輯政策提供了詳細信息。編輯委員會由其執行編輯Robert Rosebrugh，副主編Michael Barr和指導委員會協調控制期刊。 電子檔案由期刊和各種鏡像站點維護。