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Extract :

The basic contentions of the argument of this book are implicit in its title and sub-title, namely, that reality is socially constructed and that the sociology of knowledge must analyse the process in which this occurs. The key terms in these contentions are 'reality' and 'knowledge', terms that are not only current in everyday speech, but that have behind them a long history of philosophical inquiry. We need not enter here into a discussion of the semantic intricacies of either the everyday or the philosophical usage of these terms. It will be enough, for our purposes, to define 'reality' as a quality appertaining to phenomena that we recognize as having a being independent of our own volition (we cannot 'wish them away'), and to define 'knowledge' as the certainty that phenomena are real and that they possess specific characteristics.

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The social construction of  Reality