  In this paper, we take a fresh look at three Popperian concepts: riskiness,
falsifiability, and truthlikeness (or verisimilitude) of scientific hypotheses
or theories. First, we make explicit the dimensions that underlie the notion of
riskiness. Secondly, we examine if and how degrees of falsifiability can be
defined, and how they are related to various dimensions of the concept of
riskiness as well as the experimental context. Thirdly, we consider the
relation of riskiness to (expected degrees of) truthlikeness. Throughout, we
pay special attention to probabilistic theories and we offer a tentative,
quantitative account of verisimilitude for probabilistic theories.
