 Elaborating upon ideas which one can glean from Pitowsky’s work (1990, 1996, 2002), Cuffaro argues at length that quantum computation and information theory (QCIT) are practical sciences in this sense, as opposed to the “theoretical sciences” exemplified by physics under its traditional characterisation; further that recognising this distinction illuminates both areas of activity. On the one hand (Cuffaro 2017), practical investigators attempting to isolate and/or quantify the computational resources made available by quantum computers are in danger of conceptual confusion if they are not cognisant of the differences between practical and traditional sciences. On the other hand (Cuffaro 2018a), one should be wary of the significance of classical computer simulations of quantum mechanical phenomena for the purposes of a foundational analysis of the latter. For example, certain mathematical results can legitimately be thought of as no-go theorems for the purposes of foundational analysis, and yet are not really relevant for the purpose of characterising the class of efficiently simulable quantum phenomena.