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Objectives
  • To develop a conceptual data model diagram

  • To perform logical design

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

  • Create3NF Relations

Case Study

The CQ-Council (hereafter called as council) posts a full page advertisement, in local newspapers once a month, displaying all the Development Plan applications (here after called as application) that have been received during the previous month from the developers/ owners of the plots under the council’s purview.

 

General public members are allowed to raise objections against the applications that appear on those advertisements within a certain period of time, such as two weeks from the date of the advertisement.  The council maintains the details of those objections and the respective application details.  The council maintains all such objections even if they are from an anonymous member of the public.

 

The council also maintains detailed records of the following:
  • suburban areas in the council

  • lots in each suburban area

  • subdivision/merger plans

  • plots and owners


For your information, the council designates some of its suburban areas for recreation, community, commercial, residential, etc.   Some parts of the land, in each suburban area, are allocated for approach road and street facilities.  The remaining land in a suburban area is further divided into land parcels (here after called as lots). Each of such lots has a unique lot number and details of at least three boundaries and at most four boundaries.

Generally speaking, only one building is allowed to exist in one lot.  A developer, on behalf of the owner(s) of a lot, or an owner-developer of a lot (both of them are here after called as applicant) can submit an application to the council.  The applications will be received for commercial and residential area only.  Occasionally, the applicants can apply for merger of lots or subdivision of lots to create new land parcels.  The details related to mergers and sub divisions of lots have not been provided here as they are not covered in the proposed information system.

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If the application is complying with the council’s developmental policies then the council officers issue a clearance tag to that application.  Rejection letters are issued for the remaining non-compliant applications. Subsequently, they also verify the objections raised by the public on those clearance-tag-applications and discard all the irrelevant objections which are not in line with the council’s developmental policy.  If a clearance-tag-application is still left with the objections which are in line with the council’s policy then that application is rejected and a rejection letter is issued accordingly.  Thus an application is considered to be a successful application if it has received the clearance tag from the council and does not have any relevant objection from the public.  All the other applications are considered to be unsuccessful applications. Each successful application will be given a unique clearance number and the date of its clearance is recorded.

The purpose of an application can be for any of the following:
  • extension of the existing building

  • demolition of existing building and/or construction of a new building

  • tree removal

  • subdivision of a lot/merger of lots


 

The council requires that each of the tree removal application must contain the number of trees to be removed from the relevant lot.  Even though the applicable council charges for various purposes may change over a period of time, you can assume that they are fixed charges in the proposed information system.  At the time of lodging an application, the applicant has to pay the total charges of the application to the council.

 

For each of the successful development applications, the council inspectors may perform many site-inspections such as tree-removal, building foundation, building occupancy, etc., and record their date of visit and approval/non-compliance details if any.  Only one council inspector is involved in each inspection and it is needless to say that only appropriate inspections are conducted for appropriate purposes.  Based on the inspection reports submitted by its inspectors, the council will issue building occupancy certificate and tree removal permission to the respective applicants.

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Assignment Requirements

 You are expected to create an information system to cater the above information needs of the council.  In this assignment, conceptual and logical design phases of the development of that information system have to be carried out.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.
  1. Draw an appropriate ER diagram



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

Your ERDmust
  • 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 course text book


 

Somebusinessrulesorotheraspectsofthecasestudymaynotbecleartoyouwhenyoureadthecase study.Ifthisisthecase,thenyoushouldeitherapproachyourlecturerortutorforclarification,oryou maysimplymakeanassumptionandthendevelopyourERD accordingly.Forexample,thecase study might not mention all relevant participation information (also called minimum cardinalities). Ifso, you may make an assumption about what the minimum cardinalities might reasonably be, and thenshow theminyourERDaccordingly. Youshouldjustifyeachassumptionintermsofthebusiness, for example:itisassumedthateachcustomermusthaveatleastoneorderbecauseitisassumedthatthe business does not record customer details until the customer places anorder.

 

Togetyourselfstarted,askyourself,'IfIwererunningthisbusiness,whatthingsIneedtokeepa list of?'  Write those things down.  For each thing, what information would you need to record aboutit? How can it be identified? The answers to these questions will help you to develop your ERD.
  1. Assumptions and Business rules


 

Provide assumptions and business rules relevant to your ERD.
  1. Create Logical Design:



Map your Entity Relationship diagram (ERD) into relations and make sure that all the relations are in 3NF.  Provide all the relationsin the following format:

Customer (CustomerId, customerName,Street,Suburb,State,PostCode,Email)

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Invoice (InvoiceNumber, invoiceDate, Total, CustomerId)

foreignkey(CustomerId)referencesCustomer(CustomerId)

 

How and what to submit:

 

You must make an electronic submission for this assignment using the appropriate assignment submission link in the course web site.

You should submit a Microsoft Word documentcontaining:
  • A copy of your ERD.

  • A list of business rules and assumptions including theirjustifications.

  • 3NF Relations


Yourdocumentshouldcontainappropriateidentifyinginformation(yourstudentnumber,name,course number, etc.) and should contain appropriate headings for eachsection.

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Important Points

 
  • You must work individually on thisassignment.

  • The model solution to this assignment will be released approximately TWO(2) weeks after the due date.

  • Assignments that are submitted after the release of the model solution will receivezero marks.

  • You must state in your assignment(attheend under the heading Acknowledgements is a good place) all materials and sources you used. This may be as simple as 'This assignmentwas completed using only the COIT20247 course materials' if that was all youused.

  • Before submitting your assignment,review the marking criteriaas show non the marking guide (the guide will be available on the course website).Ensure that all the criteriaare addressed in your submission.

  • After submitting your assignment, please verify that your submission was successful,i.e. download your submitted files to ensure they are correct anduncorrupted.

  • Penalties related to late submission and plagiarism are handled as per the university policies.

 

Marking Criteria:



 




































 ItemMaximum Marks
1Entities have been identified, named and drawn correctly including super type and sub type entities; associative entities; weak entities (if any).5
2Provided appropriate attributes for all the entities.5
3Provided identifiers for the required entities2
4Drawn correct relationships between entities and named them appropriately.3
5Used proper symbols and shown min and max cardinalities for the relationships. Appropriate symbols have been used for super type and sub type relationships (if any)5
6Provided appropriate justification for assumptions and business rules.3
7Created correct 3NF Relations5
8Primary keys and foreign keys have been shown in relations correctly including foreign key references.2
 Penalty due to plagiarism/copying
 Late Penalty: Less 5% of available marks per calendar day.
 Total30

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