The substantive categories of the ZA Category System:

The ZA Classification has been developed by the Central Archive for Empirical Social Research in Cologne in 1970 and is used for subject indexing of studies archived in the GESIS Data Archive for the Social Sciences.

Please use the wording of a the category on the right to search for, like all studies of KAT 11 = Search term "Political Institutions"

10	Government, Political System
11	Political Institutions
12	International Institutions, Relations, Conditions
13	Political Ideology
14	Political Issues
15	Political Attitudes and Behavior
16	Political Parties, Organizations
17	Public Figures
19	Armed Forces, Defense, Military Affairs
20	Legal system, Legislation, Law
30	Economic Systems
31	Economic Policy, National Economic Situation
32	Social Policy
33	Budget and Fiscal Policy
34	Public Expenditures
35	Public Revenue
36	Branches of Economy, Services and Transport
37	Work and Industry
38	Occupation, Profession
39	Income
40	Patterns of Consumption
41	Saving, Investment of Money
42	Stock Market and Monetary Transactions
50	Society, Culture
51	Community, Living Environment
52	Group
53	Family
54	Person, Personality, Role
55	Education, School Systems
56	University, Research, the Sciences
57	Religion and Weltanschauung
58	Technology, Energy
59	Medicine
60	Leisure
62	Communication, Public Opinion, Media
65	Natural Environment, Nature
75	Historical Social Research
76	Historical Studies Data

Update 2012-09-28