© Copyright IBM Corporation 2006, 2011. All Rights Reserved. Systems Engineering Best Practices Deskbook | iii
Table of Contents
3.4.1 Architectural Analysis Package ................................................................................................................................................................... 30
3.4.2 Architectural Design Package ..................................................................................................................................................................... 31
3.5 System-Level Definitions .................................................................................................................................................................................... 32
4 CASE STUDY: SECURITY SYSTEM ............................................................................................................................................................................. 33
4.1 Getting Started.................................................................................................................................................................................................... 33
4.2 Requirements Analysis ....................................................................................................................................................................................... 34
4.2.1 Import of Stakeholder Requirements........................................................................................................................................................... 35
4.2.2 Generation of System Requirements .......................................................................................................................................................... 36
4.2.3 Linking System Requirements to Stakeholder Requirements..................................................................................................................... 38
4.2.4 Definition of System-Level Use Cases ........................................................................................................................................................ 40
4.2.5 Linking Requirements to Use Cases ........................................................................................................................................................... 41
4.3 System Functional Analysis................................................................................................................................................................................ 43
4.3.1 Uc1ControlEntry .......................................................................................................................................................................................... 44
4.3.1.1 Project Structure of the Uc1 Model ...................................................................................................................................................... 44
4.3.1.2 Definition of Uc1 Functional Flow......................................................................................................................................................... 45
4.3.1.3 Definition of Uc1 Scenarios.................................................................................................................................................................. 46
4.3.1.4 Definition of Ports and Interfaces ......................................................................................................................................................... 50
4.3.1.5 Definition of State-based Behavior....................................................................................................................................................... 51
4.3.1.6 Uc1 Model Verification ......................................................................................................................................................................... 53
4.3.1.7 Linking Uc1 Block Properties to Requirements................................................................................................................................... 55
4.3.2 Uc2ControlExit............................................................................................................................................................................................. 58
4.3.2.1 Project Structure of the Uc2 Model ...................................................................................................................................................... 58
4.3.2.2 Definition of Uc2 Functional Flow......................................................................................................................................................... 58
4.3.2.3 Definition of Uc2 Scenarios.................................................................................................................................................................. 59
4.3.2.4 Definition of Ports and Interfaces ......................................................................................................................................................... 60
4.3.2.5 Definition of State-based Behavior....................................................................................................................................................... 60
4.3.2.6 Uc2 Model Verification ......................................................................................................................................................................... 61
4.3.2.7 Linking Uc2 Block Properties to Requirements................................................................................................................................... 61
4.3.3 Merging Use Case Blocks ........................................................................................................................................................................... 62
4.4 Design Synthesis ................................................................................................................................................................................................ 63
4.4.1 Architectural Analysis (Trade-Off Analysis)................................................................................................................................................. 63
4.4.1.1 Definition of Key System Functions ..................................................................................................................................................... 64
4.4.1.2 Definition of Candidate Solutions ......................................................................................................................................................... 65
4.4.1.3 Definition of Assessment Criteria ......................................................................................................................................................... 66
4.4.1.4 Assigning Weights to Assessment Criteria .......................................................................................................................................... 67
4.4.1.5 Definition of a Utility Curve for each Criterion ...................................................................................................................................... 68
4.4.1.6 Assigning Measures of Effectiveness (MoE) to each Solution............................................................................................................. 69
4.4.1.7 Determination of Solution ..................................................................................................................................................................... 70
4.4.2 Architectural Design .................................................................................................................................................................................... 72
