This paper discusses the phonological process in the Indonesian speech, particularly on
assimilation and elision. Assimilation is the influence exercised by one sound segment upon
the articulation of another, so that the sounds become alike or more identical. Elision or
deletion is loss or omission of segments or syllables. This phenomenon might be rooted from
the fact that the speakers seem to have trouble pronouncing the words that have more than
4 (four) more syllables. Therefore, this paper discusses; (1) the types of phonological
processes frequently employed, (2) the typical vocabulary undergoing phonological
processes, and (3) the causes of phonological process in the speech. The data are the
Indonesian words which are obtained from the record of such speech as in seminar, lecture,
sermon, and conversation among people
