... no, it doesn't. He evaluates productivity in terms of the total cost, including all of those development tools & practices you list. The bulk of your argum

... no, it doesn't. He evaluates productivity in terms of the total cost, including all of those development tools & practices you list. The bulk of your argument is valid, but it's by definition included in what Jones' calculates as "productivity". It's a enormous red flashing light that says "I didn't read the linked references".