External entity-relationship diagram

Assignment Help Software Engineering

Reference no: EM132097607

Overview

The purpose of this assessment is to provide students with the opportunity to deepen, extend and apply the knowledge and skills developed from the first 3 weeks of material. Students complete the assignment individually.

As described in this course's third study guide - Software Analysis, Modelling and Specification - there are two main approaches to systems analysis specification - structured (or classical analysis) and object-oriented analysis. Your text, Software Engineering: A Practitioners Approach (Pressman, 2010) identifies these two paths as different approaches to requirements modelling.

There are special extensions to the structured approach to deal with real-time systems. Study guide three identifies a real-time system as "...a system that has to respond to external events in a pre-defined maximum time interval. Hence such systems differ from the normal software system in that their temporal performance forms part of their requirements".

This assignment asks you to individually provide the requirements analysis specification for an example of a real-time system. You will be required to complete Data Flow Diagrams (DFDs) and Entity Relationship Diagrams (ERDs) as well as include RT-SASD modifications and components including Control Flow Diagram extensions (CFDs), updates to Process Specifications (PSPECs) and Data/Requirements Dictionary as well as Control Specifications (CSPECs) (using combinational or sequential FSMs as required and presented in an appropriate format as Process Activation Tables (PATs) and/or State Transition (Machine) Diagrams (STDs)).

Assessable Tasks/Requirements

You are required to demonstrate an understanding of particular concepts covered in lectures, tutorials, laboratories and reading to provide the specification requested. This may require further reading and research beyond the material discussed in class.

Your task is to complete a Real-Time Structured Analysis Specification for the CHCSV10. You analysis should include the following components:

1. An External Entity-Relationship Diagram (ERD) indicating relationships of the CHCSV10 and the other external entities in the system. You do not need to include attributes of the entities on the ERD, just the relationships and their cardinality and modality.

2. Data and Control Flow Diagrams (DFD/CFDs) - to sufficient detail that only a single task is carried out by each process at the lowest level (Do not however model the functionality of the System Clock - Configure and Set Time, Configure Temperature Detector, Set Heating Program processes; just have a process for each). You should show the control events/flows and data flows on the same diagrams. Use the real-time extensions for control flows etc shown in the lecture notes (slides 15-17 from week 3). You need to determine when and where events will occur. For example, whenever a piece of data becomes available it may need a control event to let the system know that it is available. These events must be clearly shown in these DFD/CFD diagrams and then handled in the CSPEC.

3. Process specifications (PSPECs) - a pseudo-code or similar design language specification is required for each process at the lowest level. A narrative description alone will not be considered sufficient.

4. Control Specifications (CSPECs) - use combinational or sequential FSMs as required, presented in an appropriate format. The idea is that the CSPEC will completely describe how each and every event or control flow is handled in the system. You need to provide both "Process Activation Table" and "State Machine Diagram" as appropriate.

5. A Data Dictionary is required to adequately describe each name or special term used in the analysis. This includes process names, data flow names, data stores, control flow names, control stores and events.

You should include sufficient detail to allow the system to handle all the monitoring and control aspects specified in the Detailed Description section of this document (and any further aspects you consider essential). If you think further information is required make reasonable assumptions and clearly state these in the submission.

Attachment:- assignment.rar

Reference no: EM132097607

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Reviews

len2097607

8/27/2018 10:46:32 PM

Marking Criteria Work will be assessed according to the following: • Your Real-Time Structured Analysis must complete the five items detailed within the Assessable Tasks/Requirements section of this document. • Your Real-Time Structured Analysis should be presented as business or management style report which adheres to academic writing presentation standards. Where applicable, it must contain high quality academic presentation, expression and features as outlined

8/27/2018 10:46:20 PM

Process Specification (PSPEC) Pseudo-code (or similar design language) required for each process at the lowest level – narrative alone is not sufficient. Include ID. 15 Control Specifications (CSPEC) CSPECSs should describe how each and every event or control flow is handled in the system. Both Process Activation Tables and State Machine Diagrams are required. There should be State Machine Diagrams for at least four different components of the system. 15 Data Dictionary (DD) Every name or special term in the system needs to be defined – includes process names, data flow names, data stores, control flow names, control stores and events 15

8/27/2018 10:46:14 PM

Marking Rubric Student Name and No Marker Date Item Description Max. Marks Student Mark Entity- Relationship Diagram (ERD) Indicate the relationships between the CHCSV10 and all other external entities. Displays only cardinality and modality 10 Data Flow Diagram (DFD) A single process is displayed at the lowest level. Whenever data becomes available it needs to be displayed and handled in the CSPEC. All relevant processes are included. 15 Control Flow Diagram (CFD) Using real-time extensions for control flow to show when and where data is available. All relevant control flows and processes are included. 15

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