The Object Modeling Technique (OMT) improves upon the ER and LRDM approaches.
The notion of an object is synonymous with entity in the ER and LRDM methods.
The ER method uses the term relationship in a different and much narrower sense than LRDM and OMT.
We are left with the ER, LRDM, and OMT for further discussion.
the OMT graphical syntax appears to be cleaner than that of LRDM; and