The design of collaboration scripts is a new focus of research within the CSCL research community. In order to support the design, communication, analysis, simulation and also the execution of collaboration scripts, a general specification language to describe collaboration scripts is needed. In this chapter, we analyze the suitability and limitations of IMS LD for modeling collaborative learning processes. Based on the analysis, we propose an approach to designing a CSCL scripting language. This chapter presents the conceptual framework of this modeling language and the solutions to the identified problems of IMS LD for formalizing collaboration scripts. Especially, we compare the two approaches through modeling the same collaboration script by using IMS LD and our own CSCL scripting language.