Abstract
In political science the use of mathematics has mainly been
seen as only feasible if it was possible to make quantitative measurement.
However, until the 1960Ős the metric status of direct observations of
individual human behaviour was highly uncertain and mathematics was mostly used
for statistical description of frequencies of qualitative categories. This all
changed with the invention of probability measurement models for individual
responses borrowed from psychometrics and with the adoption of theories and
statistical methods from econometrics. In my talk I will present some of my
favourite examples of this development.