Aristotle (384-322 BCE)
A Greek philosopher who stressed the importance of direct observations in
securing facts and data. He drew conclusions from direct observations, and thus
initiated the basis for a scientific method of solving problems. Earlier
philosophers had a tendency to reach conclusions and then select data and facts
that agreed with their conclusions. He theorized that in the living world there
was a gradual change from the simple and imperfect to the more complex and
perfect, thus suggesting the idea of evolution.