Do the SOLID principles still make sense? Carl and Richard talk to Dan North about SOLID, starting with a five-minute PubConf talk that Dan did about how SOLID was wrong. Meant to be humorous (it was PubConf after all), the SOLID fans took exception, and actually led to Dan exploring how SOLID could be reinterpreted... as CUPID. With a lot of back story and laughs, Dan digs into his thinking around making sustainable, quality software with the acronym CUPID.