This paper presents an interchange language for Abstract State Machine (ASM) models based upon a metamodel, called ASM-Metamodel (AsmM), reflecting the ASMs modelling constructs and semantics as described in [4]. The AsmM is intended to be an abstract (i.e. tool’s language independent) representation of ASMs related concepts (abstract machines, signatures, terms, rules, etc.) in order to get a standard interchange format for a systematic integration of a number of a loosely-coupled ASMs tools. The efficacy of the ASM-Metamodel in representing ASMs models is showed by means of some ASM specification examples taken from [4].