The general treatment of problems connected with the causal conditioning of phenomena has traditionally been the domain of philosophy, but when one examines the relationships taking place in the various fields, the study of such conditionings belongs to the empirical sciences. Sociology is no exception in that respect. In that discipline we note a certain paradox. Many problems connected with the causal conditioning of phenomena have been raised in sociology in relatively recent times, and that process marked its empirical or even so-called empiricist trend. That trend, labelled positivist, seems in this case to be in contradiction with a certain type of positivism. Those authors who describe positivism usually include the Humean tradition in its genealogy and, remembering Hume's criticism of the concept of cause, speak about positivism as about a trend which is inclined to treat lightly the study of causes and confines itself to the statements on co-occurrence of phenomena.

I. Conditioning of Events versus Causal Conditioning.- 1. Kinds of events and kinds of conditions.- 2. Some properties of the relation of conditioning: symmetry and transitivity.- 3. Temporal relations among events. The broadest interpretation of causal conditioning.- 4. A narrower interpretation of causal conditioning: events as changes.- 5. Other narrower approaches to causal determination.- 6. Relations among events, among features and among variables.- 7. Kinds of methods of establishing causal relations.- 8. Conclusions.- II. The Simplest Case of Causal Analysis.- 1. Preliminary remarks.- 2. Statistical relationship.- 3. Dichotomous systems.- 4. Interactions among variables.- 5. Causal relationship as a relationship which is not spurious.- 6. Probabilistic definition of cause.- 7. Cause as a necessary component of a sufficient condition.- 8. Conclusions.- III. The Causal Interpretation of Relationships in Non-experimental Single Studies.- 1. The occurrence and non-occurrence of causal relationships.- 2. Intensity of causal relationships.- IV. Verification of Statements on Causal Relationships in Diachronic Research.- 1. Kinds of processes and methods of studying changes.- 2. The panel method and the verification of statements on causal relationships.- V. Verification of Statements on Causal Relationships in Experimental Research.- 1. Classical experiment.- 2. Experiment with four groups and with the possibility of controlling the effect of the first study.- 3. Incomplete schemata of experiments.- 4. Enriched schemata of experiments.- 5. Conclusions.- VI. Causal Analyses and Theoretical Analyses.- 1. Causal analyses as theories.- 2. Causal "models".- 3. The concept of cause.- 4. The problem of determinism.- VII. Human Beings and Collectivities. The Problem ofthe "Level of Analysis" in Sociology.- 1. Three meanings of membership in a collectivity.- 2. Social wholes.- 3. Classification of variables.- 4. Contextual properties.- 5. Ecological correlation.- 6. Reductionism.- Concluding Remarks: Problems Raised and Results Obtained.- Notes.- Bibliographical Postscript.- Index of Names.