Abstract. FDR3 is a complete rewrite of the CSP refinement checker FDR2, incorporating a significant number of enhancements. In this paper we describe the operation of FDR3 at a high level and then give a detailed description of several of its more important innovations. This includes the new multi-core refinement-checking algorithm that is able to achieve a near linear speed up as the number of cores increase. Further, we describe the new algorithm that FDR3 uses to construct its internal representation of CSP processes-this algorithm is more efficient than FDR2's, and is able to compile a large class of CSP processes to more efficient internal representations. We also present experimental results that compare FDR3 to related tools, which show it is unique (as far as we know) in being able to scale beyond the bounds of main memory.

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Though Timed CSP was developed 25 years ago and the CSP-based refinement checker FDR [25] was first released 20 years ago, there has never been a version of this tool for Timed CSP. In this paper we report on the creation of such a version, based on the digitisation results of Ouaknine [16,17] and the associated development of discrete-time versions of Timed CSP with associated models

Abstract. We describe and report upon various substantial extensions of the CSP refinement checker FDR including (i) the direct ability to handle real-time processes; (ii) the incorporation of bounded model checking technology; (iii) the development of conservative and highly efficient static analysis algorithms for guaranteeing livelock-freedom; and (iv) the development of automated CEGAR technology.