Introduction to Psychoanalysis and nbsp;or and nbsp;Introductory Lectures on Psycho-Analysis and nbsp;(German: and nbsp;Einführung in die Psychoanalyse) and nbsp;is a set of lectures given by and nbsp;Sigmund Freud, the founder of and nbsp;psychoanalysis, in 1915–1917 (published 1916–1917, in English 1920). and nbsp;The 28 lectures offer an elementary stock-taking of his views of the and nbsp;unconscious, and nbsp;dreams, and the and nbsp;theory of neuroses and nbsp;at the time of writing, as well as offering some new technical material to the more advanced reader. The lectures became the most popular and widely translated of his works. and nbsp;However, some of the positions outlined in and nbsp;Introduction to Psychoanalysis and nbsp;would subsequently be altered or revised in Freud's later work; and in 1932 he offered a second set of seven lectures numbered from 29–35—New Introductory Lectures on Psychoanalysis—as complement (though these were never read aloud and featured a different, sometimes more polemical style of presentation).