6. Abbreviations

Abbreviation	Expansion
API	Application Program Interface
AR	Acceptance Review
CDR	Critical Design Review
DDF	Design Definition File
DJF	Design Justification File
DRD	Document Requirements Definition
DRL	Document Requirements List
EAL	Evaluation Assurance Level
ECSS	European Cooperation for Space Standardization
ESA	European Space Agency
GCC	GNU Compiler Collection
GUI	Graphical User Interface
IDE	Integrated Development Environment
IRTAW	International Real-Time Ada Workshop
ISO	International Organization for Standardization
LSP	Liskov Substitution Principle
MF	Maintenance File
MGT	Management File
OP	Operational Plan
ORR	Operational Readiness Review
PAF	Product Assurance File
PDR	Preliminary Design Review
QR	Qualification Review
RB	Requirements Baseline
RTOS	Real-Time Operating Systems
SRR	System Requirements Review
TQL	Tool Qualification Level
TS	Technical Specification