The article suggests readers check out the WWild Team (which I did) and subsequently found an interesting article on Learning Design on Reiber's website. I like what Reiber has to say on this site about his own "philosophy" so I'll quote it below. (Go to the site for the full picture.)
Learning and Design Philosophy
We characterize our learning philosophy as constructivist, but we are not radical constructivists. We do not believe that "anything goes." Ultimate truth may be unattainable, but we feel certain ideas are more usable and consistent with accepted theory (this is akin to von Glasersfeld's 1993 concept of viability). Even if our universe turns out to be a game cartridge in some alien's Nintendo video system, some ideas are more consistent with its programming than others. Physics is a perfect example of this. Newton's laws of motion are still viable because they have practical uses even though they are no longer considered "true" by physicists. Likewise, we feel that there are times that instruction is reasonable, needed, and expected. We describe ourselves as "eclectic constructivists" to show our interest in all good ideas for promoting learning regardless of their philosophical roots. [...] We take the position that teachers and students have certain roles, responsibilities, and expectations. However, we accept the epistemology of constructivism that meaning is an individual construction, though usually in a social context. Probably the best way to describe our design philosophy is "look for ways to trigger serious play."