  On the surface, behavioural science and physics seem to be two disparate
fields of research. However, a closer examination of problems solved by them
reveals that they are uniquely related to one another. Exemplified by the
theories of quantum mind, cognition and decision-making, this unique
relationship serves as the topic of this chapter. Surveying the current
academic journal papers and scholarly monographs, we present an alternative
vision of the role of quantum mechanics in the modern studies of human
perception, behaviour and decision-making. To that end, we mostly aim to answer
the 'how' question, deliberately avoiding complex mathematical concepts but
developing a technically simple computational code that the readers can modify
to design their own quantum-inspired models. We also present several practical
examples of the application of the computation code and outline several
plausible scenarios, where quantum models based on the proposed do-it-yourself
model kit can help understand the differences between the behaviour of
individuals and social groups.
