This paper describes an approach to an object model for multimedia interactions. Multimedia interactions differ from common interactions in the requirement for sophisticated analysis of input data and that such interactions are usually time-based. They can be modeled as an extension of pure multimedia presentations (as we did). The ideas and concepts for multimedia interactions are subject to research in several computer science domains like visual computing, Artificial Intelligence, pattern recognition and image analysis. The proposed object model is a new approach to allow the arrangement of the results from different research domains in an object-framework to make them usable in a real-world multimedia toolkit. As far as it is known by the author, no other such approach exists. By extending the existing object model for multimedia presentations of the multimedia user interface toolkit MME, it is possible to smoothly integrate interactions into our system. The structure of the paper is as follows: In the first part, the notion of multimedia interactions is introduced, different types and examples of such interactions are given together with a glance at related work in this area. In the second part, the object model for multimedia interactions is presented, being closely related to the object model of MME. The remaining parts of the paper deal with a brief description of some interesting implementation issues and future developments both for the object model and the implementation.