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OIT20247 Database Design And Development

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  • To develop a conceptual data model diagram
  • To perform logical design (optional)

Assignment Specification

In this assignment, you need to perform the following tasks for the given case study:

  • Draw an Entity Relationship (ER) diagram
  • Perform logical design (optional)
  • Create 3NF Relations (optional)

Case Study

CQ Insurance (CQI) offers insurance policies to insure Home-buildings and Home-Contents of Australian residents.  For each of their properties (Homes) of interest, the customers can apply for either a Home-buildings policy or a Home-contents policy or a combined Home-buildings-contents policy.  CQI allows a customer to have only one of the above mentioned policies for each of his/her properties.

When new customers approach for an insurance policy (hereafter called as policy), CQI collects their details so that they can communicate with them in future. Each policy requires full premium payment prior to the coverage period of one year.  At the time of preparing the policies, CQI collects the details of the property (Home) and/or items (Home contents) depending upon the type of the policy that the customer is interested in.

At the time when a customer lodges an insurance claim (hereafter called as claim) such as collapse of false ceiling, loss of home contents, etc., CQI ensures that the insurance policy has not lapsed prior to processing the claims and further verifies that the items claimed have been covered by the respective policy.  A claim should be related to only one policy but each claim is not limited to only one item that has been covered by the policy.  As part of the claim-processing for each of the claims, an assessor (appointed by CQI) prepares and submits an initial assessment and if required the assessor also prepares and submits a final assessment.  The assessor’s initial assessment may recommend either to further process or reject the related claim. The assessor’s final assessment will provide the total amount that can be settled relating to the claim and may contain a memo that describes the recommended settlement amount for each of the items that have been claimed.

Assignment Requirements

In this assignment, you need to create an Entity Relationship (ER) diagram relevant to the above case study and optionally perform logical design to produce appropriate 3NF Relations.

The attributes for various entities have not been purposely described in the case study so that the students are encouraged to further research and list the pertinent attributes in addition to the required identifier for each and every entity in their ERD.

  • Draw an appropriate ER diagram

Use the symbols as prescribed in your unit-textbook to draw the ER diagram (ERD) for the above case study.  

Your ERD must

  • show all necessary entities, attributes andrelationships
  • show identifiers/identifying attributes as necessary
  • show multi-valued attributes, ifany
  • show participation andcardinality
  • show associative entities, ifappropriate
  • show weak entities, if any
  • use the notation described in the settext
  • use consistent and appropriate naming for entities and attributes  as specified in the unit text book

Provide assumptions and business rules relevant to your ERD.



Business Rules

Every Entity Relationship Model must have a strong set of business rules. For the CQ Insurance company’s database adaptation, the business rules that have been implemented into the ER Diagram are as follows:

  1. A customer can apply for only one of the insurance policies. He can buy the insurance for either a building policy or a home-contents policy for a particular property of his interest, or may be a building-contents policy.
  2. The customers must pay the complete insurance payments beforehand, for a period of 1 year.
  3. The claims made by customers must be within 1 year of application.
  4. Each claim must have required reasons.
  5. Each claim can be linked to only one policy of the customer.
  6. One claim can cover multiple home-contents.
  7. An assessor must prepare and submit both initial for each claim.
  8. An assessor can reject a claim after initial assessment.
  9. If the initial assessment is passed, the assessor must submit a final assessment.
  10. If final assessment is submitted, each claim must have a final settlement amount.
  11. Each finalized claim may have a memo that describes the amount of settlement.


Quite a few assumptions have been made apart from the laid forward business rules to design the ERD. They are as follows:

  1. Each customer must have at least one insurance policy.
  2. One insurance policy can be linked back to only one customer.
  3. For the contents insurance, each content policy can have one or more items insured.
  4. For Building & Contents policy, each policy can have one or more items insured but only one building.
  5. Each assessor may have attended none or many claims.
  6. One claimID can have zero or only one existence in the finalized list.

Figure 1 below, represents the ER Diagram for the above discussed case study.

Figure 1. Entity Relationship Diagram for CQI

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