<prompt> Main objective of Tweeds analysis:Determination of the position of lower incisors and evaluation of prognosis of a case.Profile of an individualRelationship between maxillary central and mandibular central incisorsThe position of maxilla and mandible to each other  <response>: The main objective of Tweeds analysis includes the determination of the position of lower incisor and evaluation of the prognosis of a case. The angles in Tweeds analysis are FMIA, IMPA and FMPA.Incisor mandibular plane angle IMPA is the angle between long axis of lower incisor with the mandibular plane. The mean value is 90. It indicates the inclination of lower incisor. 