> Advocates of functional languages claim they produce an order of magnitude improvement in productivity. Experiments don't always verify that figure -- someti

> Advocates of functional languages claim they produce an order of magnitude improvement in productivity. Experiments don't always verify that figure -- sometimes they show an improvement of only a factor of four. It's weird, the first time I read this I was excited to read the source of this quote. When I finished reading I scrolled up to the top and was disappointed to see a citation missing. Does anyone know what experiment he's referring to?