Ultimate presumptions seldom change…, and if they do, this normally takes place as gradual modifications of a paradigm over a longer time (evolutionary). Many people (maybe most) will, in principle, keep their ultimate presumptions all their lives once they have “taken root”. But there are those who, once during their lifetime (rarely more than once), change their minds completely about what they earlier believed in and become critical of their own former thinking. Such total shifts of paradigm often take place quickly and radically (revolutionary) after a long time of accumulating paradigmatic contradictions and deviations. So, this may be associated with deep personal crises, but also – at least afterwards – with great happiness.

Arbnor and Bjerke 2009, in Methodology for creating business knowledge