This paper discusses the thesis of adaptationism in evolutionary biology. It is argued that there is a serious scientific question here whose answer is not yet in hand. The truth or falsity of adaptationism is a substantive question about the history of life that must be decided on a trait by trait basis.
"Evolution and Optimality: Feathers, Bowling Balls, and the Thesis of Adaptationism,"
Philosophic Exchange: Vol. 26
, Article 2.
Available at: http://digitalcommons.brockport.edu/phil_ex/vol26/iss1/2