Abebew Tilahun (PhD)G/ Medhin Tariku2018-07-182023-11-042018-07-182023-11-042013-02http://etd.aau.edu.et/handle/123456789/9197This paper is concerned about on the length of D-modules,and the point of view that of modules over theWeyl Algebra.I have only tied to present the length of A2-modules and its composition series by considering polynomial rings in two variables.enOn The Length of D-ModuleThesis