Data Model Excel Template
Data Model Excel PLDZ-1
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Data Model TemplateWhat is a Data Model?
A data model describes how data is represented and accessed. Data models formally define data elements and relationships among data elements for a domain of interest.Data models help determine the meaning of data. Typical applications of data models include database models, design of information systems, and enabling exchange of data. Usually data models are specified in a data modeling language.
The role of data models
Data models support data and IT systems by providing the definition and format of data. If this is done consistently across systems then compatibility of data can be achieved. If the same data structures are used to store and access data then different applications can share data.
1 Business rules, specific to how things are done in a particular place, are often fixed in the structure of a data model. This means that small changes in the way business is conducted lead to large changes in computer systems and interfaces.
2 Entity types are often not identified, or incorrectly identified. This can lead to replication of data, data structure, and functionality, together with the attendant costs of that duplication in development and maintenance.
3 Data models for different systems are arbitrarily different. The result of this is that complex interfaces are required between systems that share data. These interfaces can account for between 25-70% of the cost of current systems.
4. Data cannot be shared electronically with customers and suppliers, because the structure and meaning of data has not been standardised. For example, engineering design data and drawings for process plant are still sometimes exchanged on paper.
A data model can be sometimes referred to as a Data Structure, especially in the context of programming languages. Data models are often complemented by function models, especially in the context of enterprise models.