Dear storyfan,
Welcome to the forum !
I'm not sure if Wallace is around much these days so I will take the liberty of initiating an answer for you. Apologies for the hijack Wallace and please correct me if I'm wrong, way over my head this stuff.
I think this specific application is original to Wallace.
If you google " deming sopk system of profound knowledge wallace tait " (without the " and ") , should point you (if google works same in Germany

) directly to a series of links where the development of this presentation is detailed in depth, especially in the initial ones.
Just in case you didn't notice, there are some other related threads here on this topic, eg
http://www.ifsqn.com...?showtopic=1389Rgds / Charles.C