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Overvie Of Core Methodology Essay

1509 words - 6 pages

Overview of CORE Methodology
Controlled Requirement Expression (CORE) was developed for the British Aerospace programs while the UK Ministry of Defence was carrying out a requirement analysis (Hull et al., 2010). The fundamental component of the CORE methodology is viewpoints as different users see systems in different ways. There are many different stakeholders involved in a system; using CORE methodology involves finding all the different viewpoints of those stakeholders that have an interest in the system whether it’s a person, role or organisation ext.… (Sommerville and Sawyer, 2000). By organising viewpoints hierarchy it assists experts to read the scope and supports the analysis process. CORE Methodology is extensively used for real time system requirements specification.

Stage 1: CORE Viewpoint Bubble Diagram
Bubble diagrams exhibit different viewpoints of a system including all function and non-function reflected from all stakeholders’ viewpoints. Once all viewpoints are identified this permits an expert to partition the viewpoint into clusters in the next stage.
CORE Viewpoint Bubble Diagram for the FASAM system below:


Stage 2: CORE Viewpoint Clusters
Stage 2 involves dividing viewpoints documented in the first stage into clusters. This allows experts to organize functions/non-functions based on viewpoints. Which makes it easier to read of the page and neater. Furthermore, it helps the expert create a CORE viewpoint hierarchy. Example Below:

Stage 2a: Bounding and Defining Viewpoints


Stage 3: CORE Viewpoint Hierarchy
Stage 3 involves creating an Architectural Model version of the whole system including sub systems. A Viewpoint Hierarchy shows a skeleton version of the system which can be inserted into the Requirement Document to show stakeholders. It’s easy to read and analysis and evolve.


Stage 4: Tabular Collection Diagrams
Tabular Collection Diagrams identify actions taken the input/outputs and processing of viewpoints (Sommerville, 2007). It’s an instrument that experts use to gather information about a viewpoint. The purpose of Tabular Collection is to uncover errors and conflicts in the information flowing across viewpoints (Kotonya and Sommerville, 1998).
Guards Viewpoint
Source Input Action Output Destination
FASAM
Message Displayed ‘Fire Detected in a Zone [ ]’ FASAM
Guard
Confirm Fire

False alarm
Fire confirmed

False alarm confirmed Sound the alarm

Alarm is disengage
Alarms

Alarms

The Fire Alarm System Viewpoint
Source Input Action Output Destination
FASAM
Presence of a fire detected Notify manned control area Message Displayed ‘Fire Detected in a Zone [ ]’ Control Area
Guard

FASAM
Confirms fire

False alarm

Nothing (Alarm is ignored)
Fire is confirmed

False alarm confirmed

Confirm Fire
Alarm is sounded

Alarm is disengage

Alarm is sounded
Alarms

Alarms

Alarms

FASAM
Fire Confirmed
Alart the emergency services

Illuminate Direction
Emergency services are...

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