The publication of the CCAE-93 is organised into four parts. The first part includes the presentation, the introduction and the decree approving the 1993 Catalan Classification of Economic Activities (CCAE-93). The second part first summarises the historical and conceptual framework in which economic classifications are developed for statistical purposes, and specifically a presentation of the harmonisation process and the characteristics of the CCAE-93. The third part contains the 1993 Catalan Classification of Economic Activities (CCAE-93), explanatory notes for the content of the most disaggregated categories, a brief version of the classification up to two digits, a subject index aimed at making inquiries easier, and a table of correspondences between the former CNAE-74 and the CCAE-93. The fourth part includes the annexes where the terminological criteria and bibliographic materials used are set out.