3LGM2 (Three-layer Graph based meta model) is a structured and in some countries already validated approach for modeling and analyzing HISs.‘3LGM2
combines a functional meta model with technical meta
models and is represented using the Unified Modeling
Language (UML)‘ (Winter, Brigl and Wendt., 2003). In a
study by Björn Schreiweis (2010), on HIS modeling it
adopts the 3LGM2 model with three layers named
domain layer, logical tool layer and physical tool layer.
These layers represent different views on a HIS.