The first time I met Da was through a student and colleague of mine in Blankenberge for FLINS 2004. They exchange about our paper on intelligent image retrieval through linguistic color expressions.
Then I met him in Madrid for FLINS 2008. I presented a paper with my PhD student on fuzzy logic coupled with service-oriented architectures. We talked about mixing fuzziness and GAI (Generalized additive independent) networks, such as the conditional preference networks.