The Basic Problems of Phenomenology is the text of a lecture course that Martin Heidegger gave at the University of Marburg in the summer of 1927. Only after almost half a century did Heidegger permit the text of the course to be published.
In the Editor’s Epilogue, which follows the text, Professor von Herrmann explains that the book was composed, under Heidegger’s direction, by putting together Heidegger’s manuscript of the lectures and his typewritten copy, including his marginalia and insertions, with a contemporaneous transcription of the lectures by Simon Moser, a student in the course. The editor made decisions regarding a number of matters such as the division into parts and their headings; the treatment of insertions, transformations, changes, expansions, and omissions; and the inclusion of recapitulations at the beginning of lecture sessions. The resulting work is therefore only one possible version of the 1927 lecture course. But it is surely a very ample one, containing almost the whole of what was spoken and also much of what was not spoken at the time.
This volume represents the way in which Heidegger himself visualized the printed shape of these early lectures. Whatever imperfections the present text may contain, The Basic Problems of Phenomenology is a work of major importance, indispensable for obtaining a clear outlook upon the ontological-phenomenological region toward which Heidegger was heading when he prepared Being and Time, of which this is the designed and designated sequel. In it, one form of the Heideggerian Kehre took place-a turning-around, from concentration upon the human being as Dasein, which in older thought was concentration upon the subject, to the passionately sought new focusing upon-not any mere object correlative to a subject but-being itself.
Simon Gros 
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