The present scientific article has as objective to argue the existing relation it enters the intervention of the third (assistance) and happened effect of the sentence in face of them. It will be observed, throughout the work that has a significant difference how much to the procedural treatment data to the simple and qualified assistants, also in what it refers to these to have its affected legal spheres or not, for the sentence in considered thing. In this prism, this paper it defends the distinction of the part concepts (part of the demand and party to suit) to adjust them it each type of assistance, the procedural differentiation between the litisconsorcial assistance and the joinder of parties, beyond the distinct applicability of the effect of the sentence in face of the two types of assistants. Intervention of Third; Assistance Simple; Litisconsorcial assistance; Considered thing. It Is common and of the knowledge of that the effect produced for a legal relationship of material right can reach the legal sphere of interests of third strangers to the procedural relation. This means to say that the procedural quarrels can interest the bearers of the material relation not only, as well as to other people who if find outside of the process and that they can be reached direct or indirectly for the decision provided with the same.. Get all the facts and insights with Ohio Senator, another great source of information.