This document describes a stock assessment of red rock lobsters in CRA 4 and development of operational management procedures, using the length-based multi-stock model MSLM, fitted to two abundance indices, size frequency data, tag-recapture data and a puerulus settlement index. The document describes the MPD base case, McMC simulations, diagnostics and McMC sensitivity trials. Short-term projections were made at the current assumed levels of catch and with an alternative catch level with a lower level of recreational catch.