Full title   Preliminary Studies for the "Philosophical Investigations," generally Known as the Blue and Brown Books

Author   Ludwig Wittgenstein

Philosophical movement   Analytic philosophy, although Wittgenstein rejects the philosophical importance of logic, which is one of the key aspects of analytic philosophy

Language   English

Time and place written   Blue Book 1933–34, Brown Book 1934–35; both at Cambridge University

Date of first publication   1958

Publisher   Harper & Row (USA); Basil Blackwell (UK)

Speaker   The Blue and Brown Books are transcriptions of lectures Wittgenstein gave to his students at Cambridge

Philosophical influences on the work   No clear influences, although there is a general influence of Frege and Russell, and perhaps some influence of the Vienna Circle

Philosophical influences of the work   Ordinary language philosophy