A Quarter of a Century of Methodology - The Emergence of Longitudinal Analysis, Social Networks and Textual Statistics: Using the titles, abstracts and key words (in French) of the 318 articles in the BMS, issues 1 to 99, the author analyzes this corpus with hierarchically ascending and descending classification programs and with factoral correspondence analysis. With the results of these three methods, he describes in detail five major thematic classes: Survey Situation, Longitudinal Analysis, Social Network Analysis, Theoretical Debate and Textual Analysis. Their interrelationship and évolution over time is also described.