Psykolingvistiikan alaan kuuluva suomen kielen väitöskirja. Slips of the Tongue provide an open window to unconscious representations and processes in speech production. This study is a report on naturally occuring errors in spontaneous speech. It describes the types of slips which arise, the constraints that govern the arousal of these errors, and how speakers repair the slips they commit. The Slip of the Tongue is doctoral thesis