| ER Models | ERM References | ERM Anthologies |
| Model No. | 1 | |||
| Short Citation | (Chen 1976) | |||
| Year | 1975 | |||
| Special Name | ||||
| Descendant of | ||||
| Constructs | Inherent | Entity Type | sg: weak | |
| Relationship Type | sg: existence dependency, sg/l: mapping (1:N,M:N, 1:1) | |||
| Value Sets / Attributes | sg: key, sg/l: role | |||
| New | Invented | Adapted | ||
| Included | ||||
| Borrowed | Included | |||
| Added | ||||
| Syntactic Rules | (1) Relationship types connect entity types. (2) Entity types are assigned attributes. (3) Relationship types can be assigned attributes. | |||
| Semantics | formalized | |||
| Focus | g | |||
| Data Definition | e | |||
| Data Manipulation | e | |||
| Remarks | ||||
| Cause | Citation | ERM incorporates ... semantic information about the real world (p. 9),... framework from which the three existing data models may be derived (p. 10). | ||
| Content | Expressiveness | structure | ||
| Applicability | ||||
| Correction | ||||
| Integration | X | |||
| Implementation | ||||
| Other | ||||
| Alternative Publications | (Chen 1975) | |||
| Binary Vector | Structure/General | [E1] | ||
| [E2] | 1 | |||
| [E3] | ||||
| [E4] | ||||
| [E5] | ||||
| [E6] | ||||
| Structure/Integrity | [E7] | f | ||
| [E8] | ||||
| [E9] | f | |||
| [E10] | 1 | |||
| [E11] | i | |||
| [E12] | ||||
| [E13] | ||||
| [E14] | ||||
| [E15] | ||||
| [E16] | ||||
| Behavior | [E17] | |||
| [E18] | ||||
| Application | [E19] | |||
| [E20] | ||||
| [E21] | ||||
| [E22] | ||||
| [E23] | ||||
| [E24] | ||||
| [E25] | ||||
| [E26] | ||||
| [E27] | ||||
| Domain-Specifics | [E28] | |||
| [E29] | ||||
| [E30] | ||||
| [E31] | ||||
| [E32] | ||||
| [E33] | ||||
| Expressiveness Values | Total | 0.15 | ||
| Data Model | 0.28 | |||
| Application | 0.00 | |||
| Domain Specifics | 0.00 | |||
| Partially Redundant Constructs | Conjunctive Concepts | W | ||
| Linked Concepts | ||||