Our Knowledge of the External World, first published in 1914, along with the Introduction to Mathematical Philosophy from 1919, encompasses all of Russell's significant epistemological and logical views. Originating from the Lowell Lectures, a series of lectures that Russell delivered at Harvard University in Boston in 1914, the work addresses the nature and acquisition of certain knowledge about the objective external world and seeks answers to the questions of what the world is and how humans perceive it. At the center of the discussion is the relationship between sensory data and space, time, and the subject of mathematical physics. Russell's application of the logical-analytical method to philosophy is based on the understanding of logic and perception as absolute foundations upon which all knowledge can be reduced. It reveals uniqueness and effectiveness.