SDF - Space Delimited File

SDG - System Dependence Graph

SDH - Synchronous Digital Hierarchy

SDI - Single Document Interface

SDIF - SGML Document Interchange Format

SDIS - Simmer Database Interchange Specification

SDK - Software Developer's Kit

SDL - Software Description Language

SDLC - Synchronous Data Link Control

SDLM - Software Distributed Lock Manager

SDM - Semantic Data Model

SDM - Space - Division Multiplexing

SDN - Synchronous Digital Hierarchy

SDN - Systems Development Needs

SDQM - Strategic Data Quality Management

SDR - System Design Review

SDS - Software Development System

SDSL - Symmetric Digital Subscriber Line

SDT - Software Design & Testing

SDT - Synchronous Digital Transmission

SDTI - Synthetic Discrete Tone Image

SDTV - Standard Digital TV

SDU - Service Data Unit

SDV - Singular Decomposition Value

SEAL - Simple Efficient Adaptive Layer