J.L. Austin was an important figure in the "ordinary language" approach to philosophy popular in the 50s and 60s. This approach, which was heavily influenced by the later Wittgenstein, tried to dissolve philosophical problems by paying careful attention to how we speak in ordinary life.
Austin's Sense and Sensibilia deals with perception. Many philosophers had claimed that we directly perceive sense data, not material objects, and so perhaps should doubt the existence of material objects. Austin criticized this approach.
These summaries and problems deal with Chapters 1 and 2 of Austin's Sense and Sensibilia (New York, Oxford University Press, 1964). These exercise materials are copyrighted (c) 1998 by Harry J. Gensler but may be distributed freely.