 Because the term ‘Bayesianism’ may be understood in many different ways, a variety of views of quantum theory could be considered Quantum-Bayesian. QBism is a form of Quantum Bayesianism that may be traced back to a point of view on states and probabilities in quantum theory adopted by C.M. Caves, C.A. Fuchs, and R. Schack (2002). In its more recent incarnation (Fuchs, Mermin, &amp; Schack 2014) its proponents have adopted the name QBism for reasons discussed in  §1.1.  In deference to its contemporary proponents, this shorter name is used. Fuchs, Mermin, and Schack 2014, and DeBrota and Stacey (2019,   Other Internet Resources)  provide elementary introductions to QBism; Fuchs and Schack 2015, and Fuchs and Stacey 2019 give more detailed summaries of the view; von Baeyer 2016 is a popular book-length introduction