| FI | Feature Interaction |
| CI | Configuration Interaction |
| BNI | Before Next Interaction [engl.] |
| NQI | Nuclear Quadrupole Interaction |
| PCI | Post-Collision Interaction |
| RCI | Restricted Configuration Interaction |
| FCI | Full Configuration Interaction |
| HCI | Hylleraas Configuration Interaction |
| ISF | Interaction Site Formalism |
| EIC | Electrostatic Interaction Chromatography [alt.:IEC] |
| ILO | Interaction Localized Orbital |
| IEC | Electrostatic Interaction Chromatography |
| MRCI | Multi Reference Configuration Interaction |
| CHI | Computer Human Interaction/Interface |
| ccci | Correlation-Consistent Configuration Interaction |
| cpci | Coupled-Perturbed Configuration Interaction |
| HCI | Human Computer Interaction/Interface |
| RISM | Reference Interaction Site Model |
| LFCI | Ligand Field Configuration Interaction |
| DC-CI | Dissociation-Consistent Configuration Interaction |
| MVIP | Multi Vendor Integration/Interaction Protocol |
| BIC | Biospecific Interaction [affinity] Chromatography [engl.] |
| SDCI | Singly and Doubly excited Configuration Interaction |
| DIPR | Direct Interaction with Product Repulsion [Modell] |
| DFT | Design For Test |
| MDL | Molecular Design Ltd. |
| SD | Structured Design |
| DTC | Design To Cost |
| DC | Design Change |
| EDA | Electronic Design Automation |
| EDA | Electronic Design Automation |
| HDL | Hierarchical Design Language |
| ESD | Electronic System Design |
| FED | Fachverband Elektronik Design |
| GEDA | GNU Electronic Design Automation |
| IDE | Interactive Design and Engineering |
| IDE | Interface Design Enhancement |
| TDP | Typical Design Power typischer Verbrauch |
| SDL | System Design Language |
| SDDC | System Design Document |
| SDA | System Design Automation |
| SD&D | Specific Development & Design |
| PDS | Program Design Specification |
| PDL | Program Design Language |
| OOD | Object Oriented Design |
| NDT | Network Design Tool |
| ND&I | Network Design & Installation [Sun] |
| MDR | Minimum Design Requirement |
| MDE | Modular Design Environment |
| M.T.D | Master of Transportation Design Akademischer Grad |