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In spite of their industrial success, the development of intelligent systems is still a complex and risky task. When buildingintelligent systems, we see that domain knowledge is often present at different levels of formalization?ranging from textdocuments to explicit rules. In this paper, we describe the knowledge formalization continuum as a metaphor to helpdomain specialists during the knowledge acquisition phase. ; To make use of the knowledge formalization continuum, theagile use of knowledge representations within a knowledge engineering project is proposed, as well as transitions betweenthe different representations, when required. We show that a semantic wiki is a flexible tool for engineering knowledge onthe knowledge formalization continuum. Case studies are taken from one industrial and one academic project, and theyillustrate the applicability and benefits of semantic wikis in combination with the knowledge formalization continuum.