“…Traditionally, FCs are derived from explicit customer needs. However, in many contexts, and especially those where end users have no clear idea, or insufficient knowledge, it is prohibitively difficult or unadvisable to have users explicate their needs [20]. Therefore, in our approach we replace the laddering process with a more tacit approach involving an extracted rule base that acts on sensor readings and recommends FCs according to the rule base (see section 3.2: 'Rule extraction and mapping').…”