IDEF0 is a graphical process modeling technique developed by US Air Force. Uses boxes and arrows to represent processes and their relationships. Provides clear hierarchical view of organizational or system activities
New comprehensive framework for security studies developed by Buzan, Waever, and de Wilde. Addresses traditionalist and widener approaches to security studies. Rejects narrowing security to military-political sector
Textbook focuses on core skills needed for all systems analysts. Organized by phases of systems development life cycle. Each chapter describes specific tasks and provides practice exercises
PVGIS is a free online solar energy calculator for grid-connected and off-grid systems. Developed by JRC from European Commission's science services. Available in English, Italian, French, Spanish and German
SSADM is a waterfall method for information systems analysis and design. Developed by UK government's Central Computer and Telecommunications Agency since 1980. Builds on various structured analysis methods including Checkland and Jackson. Registered trademark of UK's Office of Government Commerce
Mathematical model is an abstract description of a system using mathematical concepts. Used in natural sciences, engineering, social sciences, and business operations. Helps explain systems, study component effects, and make predictions