Software Reliability Assurance Handbook

Software Reliability Assurance Handbook - SYSTEM AND...

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SYSTEM AND SOFTWARE RELIABILITY ASSURANCE NOTEBOOK Produced For Rome Laboratory By Peter B. Lakey, McDonnell Douglas Corporation, St. Louis, MO Ann Marie Neufelder, SoftRel, Hebron, KY FSC-RELI
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ii FOREWORD This notebook provides a reliability assurance methodology to predict and estimate the reliability of systems that employ both hardware and software subsystems. Since the methods used to predict the reliability of hardware systems are well established, this notebook concentrates on the methods to predict and estimate the reliability of software configuration items and methods for combining hardware and software reliability metrics into an overall system parameter.
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iii System and Software Reliability Assurance Table of Contents 1.0 INTRODUCTION 1-1 2.0 APPLICABLE DOCUMENTS 2-1 3.0 DEFINITIONS AND SYMBOLS 3-1 3.1 Definitions of Terms 3-1 3.2 Abbreviations 3-4 3.3 Mathematical Symbols 3-5 4.0 OVERVIEW 4.1 System Reliability Prediction and Estimation Program. 4-1 4.1.1 System Modeling. 4-1 4.1.2 System Reliability Allocation. 4-7 4.1.3 System Reliability Prediction. 4-8 4.1.4 System Reliability Growth. 4-8 4.1.5 System Reliability Qualification Testing. 4-9 4.1.6 System-Level Failure Reporting and Corrective Action System (FRACAS). 4-9 4.2 Hardware Reliability Prediction and Estimation Program 4-9 4.2.1 Hardware Reliability Modeling 4-9 4.2.2 Hardware Reliability Allocation. 4-10 4.2.3 Hardware Reliability Prediction. 4-10 4.2.4 Hardware Reliability Growth. 4-10 4.2.5 Hardware Reliability Qualification Testing. 4-10 4.2.6 Hardware FRACAS. 4-11 4.3 Software Reliability Prediction And Estimation program 4-11 4.3.1 Software Reliability Modeling 4-13 4.3.2 Software Reliability Allocation 4-13 4.3.3 Software Reliability Prediction 4-14 4.3.4 Software Metrics Collection 4-16 4.3.5 Software Reliability Growth Testing 4-18 4.3.6 Software Reliability Qualification Testing 4-19 4.3.7 Software Failure Reporting and Corrective Action System (FRACAS) 4-21
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iv 5.0 HARDWARE/SOFTWARE SYSTEM RELIABILITY MODELING 5-1 5.1 Basic Reliability Model 5-1 5.2 Mission Reliability Model 5-1 5.2.1 System FMEA Development 5-3 5.2.2 System-Level Reliability Model Development 5-5 5.2.3 Developing Detailed Reliability Models 5-5 5.2.4 Reliability Modeling of Hardware/Software Elements 5-6 5.2.4.1 Modeling Series Hardware/Software Elements 5-6 5.2.4.2 Modeling Redundant Hardware/Software Elements 5-7 5.2.4.2.1 Redundant Hardware Models 5-7 5.2.4.2.2 Redundant HW/SW Models 5-9 5.2.4.2.2.1 Cold Standby Systems 5-10 5.2.4.2.2.2 Hot Standby Systems 5-11 5.2.5 Hardware Failure and Repair Rates 5-13 5.2.6 Software Failure Rates 5-13 5.2.6.1 Timing Configurations 5-13 5.2.6.2 Reliability Topology 5-14 5.2.6.3 Notation 5-14 5.2.6.4 Software Failure Rate Adjustment 5-14 5.2.6.5 SW Reliability Combination Models. 5-15 Procedure 5.2.6.5-1 - Sequentially active software model. 5-16 Procedure 5.2.6.5-2 - Concurrently active software model. 5-17 Procedure 5.2.6.5-3 - Mission oriented software combination model 5-18 6.0 RELIABILITY ALLOCATION. 6-1 6.1 System Reliability Allocation. 6-1 6.2 Hardware Reliability Allocation. 6-1 6.3 Software Reliability Allocation 6-1 Procedure 6.3-1 - Equal apportionment applied to
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Software Reliability Assurance Handbook - SYSTEM AND...

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