Three-schema approach
![The notion of a three-schema model was first introduced in 1975 by the ANSI/X3/SPARC three level architecture, which determined three levels to model data.[1]](/Images/godic/202501/12/4-2_ANSI-SPARC_three_level_architecture.svg0349.png")
![Figure 1: Traditional View of Data[6]](/Images/godic/202501/12/A2_2_Traditional_View_of_Data.svg0349.png")
![Figure 2: Three schema approach[6]](/Images/godic/202501/12/A2_3_Three_schema_approach.svg0349.png")
![Image of the six layers in the Zachman Framework.](/Images/godic/202501/12/ZF_What_column_Data_example.svg0349.png")
The three-schema approach, or three-schema concept, in software engineering, is an approach to building information systems and systems information management that originated in the 1970s. It proposes three different views in systems development, with conceptual modelling being considered the key to achieving data integration.{{Cite web|url=