Hm, I thought the leading person around the concept of cost increases later in the cycle was actually Capers Jones, and his text about it and cleanroom: The Eco

Hm, I thought the leading person around the concept of cost increases later in the cycle was actually Capers Jones, and his text about it and cleanroom: The Economics of Software Quality. Obviously this is NOT about TDD, but about Cleanroom, but it seems like you've done a lot of research in the area.