1. Development programs and model philosophy1 Preliminary design review Prototype program Critical design review Qualification program Qualification review Flight program Flight acceptance review Preliminary design program

2. Development programs and model philosophy2 Preliminary design ( system design, architectural design) Established at PDR: Design choices, trade-offs Design choices, trade-offs Internal and external interfaces frozen Internal and external interfaces frozen Internal and external environment Internal and external environment Functions and performances Functions and performances Design & performance verification program Design & performance verification program Feasibility of critical items Feasibility of critical items EGSE and test-equipment planning EGSE and test-equipment planning Start prototype program PDR

3. Development programs and model philosophy3 Critical design review Revisit PDR more accurately Documentation: Specification, ICD, drawings Specification, ICD, drawings User manuals User manuals Plans: AIV, test equipment, qualification, verification control etc Plans: AIV, test equipment, qualification, verification control etc FM-design ready Start qualification program CDR

4. Development programs and model philosophy4 Qualification review Established at QR: Functions and performances verified Functions and performances verified Manufacturing / workmanship verified for launch and space environment Manufacturing / workmanship verified for launch and space environment QR

5. Development programs and model philosophy5 Acceptance review Established at Flight acceptance review: Functions and performances verified Functions and performances verified Manufacturing / workmanship verified for acceptance Manufacturing / workmanship verified for acceptance Instrument characterization and calibration Instrument characterization and calibration AR

6. Development programs and model philosophy6 Development programs and highlights PDR CDR QR AR prototype qualification flight Specifications frozen Interfaces frozen Environment known Trade-offs made ICDs, specs, User manuals Verification control matrix Plans Functions, performance verified workmanship tested at Qualification- level Functions, performance verified workmanship tested at acceptance level Instrument calibrated, characterized

7. Development programs and model philosophy7 Concurrent programs for all units prototype qualification flight Unit #3 Unit #2 Unit #1

8. Development programs and model philosophy8 Shortcut to proto-flight model CDR AR protoflight Specifications frozen Interfaces frozen Environment known Trade-offs made ICDs, specs, User manuals Verification control matrix Plans Functions, performance verified workmanship tested at Qualification- level Functions, performance verified workmanship tested at acceptance level Instrument calibrated, characterized

9. Development programs and model philosophy9 EMQMFMSTM remark 1.1.1 Detector subsystem hardware 1.1.1.1IDC 1.1.1.2cryostat 1.1.1.2.1FEA 1.1.1.2.2ADR 1.1.1.2.3ST 1.1.1.2.4ST/JT 1.1.1.3AAC 1.1.1.4CDE 1.1.1.5PSU 1.1.1.6radiator 1.1.1.7 calorimeter array 1.1.1.8 in-flight calibration source 1.1.1.9CAP 1.1.1.10CDP 1.1.1.11 flight harness 1.1.2 Detector subsystem software 1.1.2.1IDC-software 1.1.2.2CDP-software 1.1.2.3 cmd/hk database

10. Development programs and model philosophy10 EMQMFMSTM remark 1.2.1 Telescope subsystem hardware 1.2.1.1Tube 1.2.1.2 Mirror module 1.2.1.3Cover 1.2.1.4tac 1.2.1.5Heaters 1.2.1.6thermistors 1.2.1.7 flight harness 1.2.2 telescope subsystem software 1.2.2.1 cmd/hk database