Computing
- Software Design Description (IEEE 1016–1998), a standard that specifies the form of the document used to specify system architecture and application design in a software-related project
- Software Design Document, a written outline of the development of a course or a description of a software product
- Solution Deployment Descriptor, a proposed OASIS standard for software deployment, configuration and maintenance
- Subsystem Device Driver, a multi-platform device driver designed to support the multipath configuration environments in IBM storage environments
- Software Design and Development, a HSC subject in NSW that details the basics of designing and developing software applications
- Syntax-Directed Definition - a context-free grammar with attributes and rules
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