The document provides guidelines for implementing a Halal Assurance System (HAS) to ensure that certified halal products remain halal throughout the validity period of an MUI Halal Certificate. It outlines the HAS certification process and requirements, including developing a HAS manual, conducting internal audits, implementing corrective actions, and undergoing external assessments of the HAS. The goal of HAS is to maintain sustainable halal production according to LPPOM MUI standards and rules.