The RISC-V community is perhaps unique in pushing for an early formal specification of the RISC-V ISA (Instruction Set Architecture), and to declare an intention that it will become the definitive spec of the ISA. A task group was set up within the RISC-V Foundation to develop this spec, with active contributions and participation from about a dozen organizations, representing academia and industry. The speaker (who chaired this group) will describe the technical and process challenges in converging on a community-driven, open, non-proprietary, industrial-strength ISA spec.