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Concept model vs. Data model

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LN Mishra

Concept model vs Data model - When to use what?

Concept models are a bit rarity than data models.

How do these 2 models relate and extend each other?

Which one comes first?

Let’s explore.

BABoK V3 definition of Concept model:

A concept model is used to organize the business vocabulary needed to consistently and thoroughly communicate the knowledge of a domain.

BABoK V3 definition of Data model:

A data model describes the entities, classes or data objects relevant to a domain, the attributes that are used to describe them, and the relationships among them to provide a common set of semantics for analysis and implementation.

Let’s look at the concept model for Adaptive RED, Adaptive’s Enterprise Requirements warehouse.

Concept model - Adaptive RED

As we can see, Adaptive RED  deals with 4 major concepts – Requirements engineer, Requirements warehouse, Requirements and Requirements history. These concepts are interrelated and depicts how information is managed within Adaptive RED .A data model is also represented in the form of diagrams supported by textual descriptions, but there’s a little more to it. It depicts elements which are important to the business, the attributes associated with those elements, and the significant relationships among them.

 

Data models are of several types:

Type Description
Conceptual data model Represents business information regardless of the solution or technology. Helps to establish a consistent vocabulary which describes business information and the relationships between them just like the concept model
Logical data model More formal approach and incorporates rules. Used to design a solution
Physical data model

ER Diagram - RED

Describes physical data organization in a database. Addresses concerns like performance, concurrency and security.

 

In a data model, the organization keeps data on entities (or classes or data

objects). In relation to a database, an entity is a single person, place, or thing about which data can be stored. It contains attributes and has relationships to other entities in the model. The number of occurrences to which an entity may be related is known as cardinality. It can be zero, one or many.

Let’s see how the entity relationship diagram (ERD) for Adaptive RED looks like. Here, requirements is an entity with attributes such as requirements ID, description etc. The relationship between the entities requirements and requirements history is one to many.

ER Diagram - RED

In a class diagram, entities are referred to as classes. A class contains attributes and has associations (same as relationship in entity model) with other classes and also contains operations that describe what can be done with the class. Here, the term multiplicity is used instead of cardinality. In the Adaptive RED class diagram, let’s look at the requirements class. The attributes with regard to requirements are requirements ID, description, status etc. and the operations which can be carried upon it are add, update etc. which means a requirement can be added, updated, deleted and so on.

Class diagram - RED Class diagram - RED

To summarize

Aspect Concept model Data models
Purpose To explain relationships between concepts To describe entities/classes, attributes, and relationships
Typical representation Relationship diagram Entity relationship diagram (ERD)

Class diagram

Key differences Supports the expression of natural language statements

Business-friendly way to communicate with stakeholders

Represents logical design of data and requires knowledge of notations

Requires some IT background

Hope this clarifies the 2 techniques and their usage.

 

 


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