3ca70210_ned_versus_Derived_Data_Models__Native_Approach
[External Approach] All data model changes must be done externally; extra effort required to import data model; therefore you will probably want data model to be well defined before commencing with development [Native Approach] 
Data model can easily evolve during application development; the initial definition of the data model can be pretty loose
11. Deciding between Defined versus Derived Data Models
Native Approach