The full form of STAAD is Structural Analysis and Design.

Prior to breaking ground on any new construction project, important structural and design considerations must be addressed. Using the project’s architectural plans, structural engineers begin preparing a detailed structural analysis and design plan, adhering to these four important factors.

Structured analysis and design technique (SADT) is a systems engineering and software engineering methodology for describing systems as a hierarchy of functions. SADT is a structured analysis modelling language, which uses two types of diagrams: activity models and data models. It was developed in the late 1960s by Douglas T. Ross, and was formalized and published as IDEF0 in 1981.