CONTENIDO: The discovery of grounded theory. -- Generating theory by comparative analysis. -- Theoretical sampling. -- From substantive to formal theory. -- The constant comparative method of qualitative analysis. -- Clarifying and assessing comparative studies. -- The flexible use of data. -- New sources for qualitative data. -- Theoretical elaboration of quantitative data. -- Implications of grounded theory. -- The credibility of grounded theory. -- Applying grounded theory. -- Insight and theory development.