BIS IS/IEC 61511-3 : 2003

NATIONAL FOREWORD
INTRODUCTION
1 SCOPE
2 TERMS, DEFINITIONS AND ABBREVIATIONS
3 RISK AND SAFETY INTEGRITY - GENERAL
  GUIDANCE
ANNEX A (INFORMATIVE) - AS LOW AS REASONABLY
        PRACTICABLE (ALARP) AND TOLERABLE RISK CONCEPTS
ANNEX B (INFORMATIVE) - SEMI-QUANTITATIVE METHOD
ANNEX C (INFORMATIVE) - THE SAFETY LAYER MATRIX METHOD
ANNEX D (INFORMATIVE) - DETERMINATION OF THE REQUIRED
        SAFETY INTEGRITY LEVELS - A SEMI-QUALITATIVE
        METHOD: CALIBRATED RISK GRAPH
ANNEX E (INFORMATIVE) - DETERMINATION OF THE REQUIRED
        SAFETY INTEGRITY LEVELS - A QUALITATIVE METHOD:
        RISK GRAPH
ANNEX F (INFORMATIVE) - LAYER OF PROTECTION ANALYSIS (LOPA)

Gives information on: - the underlying concepts of risk, the relationship of risk to safety integrity; - the determination of tolerable risk; - a number of different methods that enable the safety integrity levels for the safety instrumented functions to be determined.