This thesis examines the issue of "intermediate position of major disobedient (manzila_baina_almanzilatain) as per the Ibadi and Mu'tazila Schools of Thought in the first six centies of Hijrah. It is divided into three chapters. The preface presents the historical formation of this issue from the moment of its appearance. It highlights the relationship between this issue and the other Islamic doctrinal issues. The first chapter deals with the relationship between intermediate position of major disobed (manzila_baina_almanzilatain and the human action. The first section of this chapter identifies the point of view of the two Schools of Thought on the question of obligation and choice. The second section explains the importance of the kasb with Ibadi thought, identifying the point of view of the two Schools of Thought on the Ability and its relationship with human action. The last section addresses the question of Will, Infallibility and Abandonment. It analyzes the issue of will, indicating its relationship to Creation of Acts and Commands. It also links the issue of Infallibility and Abandonment to the human action. Since the issue of "intermediate position of major disobedient (manzila_baina_almanzilatain)" deals with the Asma and Ahkim, the second chapter studies the Asma, explaining the link between this issue, Faith and Infidelity. The first section of this chapter addresses the truth of faith and its relation to Islam, examining its increase and decrease. It determines the position of the perpetrator of the great sins from the position of the believers according to the Ibadis and Mu'tazila. The second section studies infidelity according to the Islamic sects, explaining its levels and comparing its terms. It determines exactly the position of the perpetrator of the great sins from the position of the infidel according to the Ibadis and Mu'tazila The third chapter focuses on the second part of the issue, which is the issue of Ahkim. It examines the link between intermediate position of major disobedient (manzila_baina_almanzilatain " and the promise and threat. It identifies the the position of the perpetrator of the great sins in regard to "Protection" and "Freedom from obligations." The second shows the reality of considering others as infidels according to the Ibadis and Mu'tazila. The third section discusses the issue of intercession, focusing on the issue of intercession with the perpetrator of the great sins. The final section concludes with issue of immortality in the hellfire, discussing the opinions of the Islamic sects and analyzing the evidence of those who are with and those who are against. This study concludes with several results, most notably: The Ibadis consider the issue of the multiplicity of bodies as the basis of the issue of the creation of actions; the lack of awareness of Mu'tazila of this issue has led them to them led them to immoderation. Ibadis and Mu'tazila differ in considering the perpetrators of the great sins as infidels based on their understanding of the meaning of infidelity. Ibadis consider it to be contrary to faith while the Mu'tazil considers it against it. The two sects apree that the deeds of the perpetrator of the great sins will be in vain, giving the fact that they disagree in the balance. The two sects agree on the immortality of the perpetrator of the great sins in the hellfire, but they disagree on the scale of his her punishment.