In sociology, phenomenology is a movement that promotes an understanding of the association between states of individual awareness and social life. It seeks to reveal how human consciousness is concerned in the invention of social act, situations and worlds. Phenomenology is a philosophical method of inquiry developed by the German philosopher Edmund Husserl. It involves the systematic investigation of consciousness. Consciousness, it is argued, is the only phenomenon of which we can be sure. It is assumed that our experience of the world, including everything from our perception of objects through to our knowledge of mathematical formulae, is constituted in and by consciousness.