There is an essential aspect of Pierre Bourdieu’s work that has been somewhat neglected by those who have written about his theory and that is his constant concern for quantifying his data material and for putting his thinking in mathematical terms.1 This chapter provides landmarks for this aspect of his work, and outlines Bourdieu’s approach, at least from La distinction (Bourdieu 1979 [42]) onwards: namely the geometric modeling of data, based on Geometric Data Analysis (GDA).