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SYS366

Week 10, Lecture 3

Systems Requirements Gathering:

Identifying Operating Requirements

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Requirements

Needs and Features are informal. Needs, Features and Requirements represent

different views of the system.

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Identifying Requirements

The Requirements view is provided by the product feature set and other high-level product requirements definitions.*

Bitner & Spence, p.74

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Identifying System Requirements

“A requirement is a desired feature, property or behavior of a system.” *

* Unified Modeling Language

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Features

“Features are not useful for defining the behavior of the system in precise enough terms to design, develop, or test the system.” *

* Use Case Modeling, by Bittner & Spence, page 6.

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Identifying System Requirements

A requirement “is either derived directly from stakeholder or user needs

Or

stated in a contract, standard, specification, or other formally imposed document.” *

* Use Case Modeling, by Bittner & Spence, page 5.

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Requirements Gathering

For an existing system, analyst needs to find out:– Functionality

what functionality of the existing system will be included in the new system

– Data needs what data from the existing system will need to

be migrated into the new system

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Requirements Gathering

For a new system, analyst needs to find out:– Functionality

What are the activities the system needs to perform?

How is the user to interact with the system?Are other systems to interact with the system?

– Data needsWhat information is needed?

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Operating Requirements

“the product (from the Product Position statement) to be produced results in requirements being placed on the operating environment in which it will be deployed” *

These operating requirements that must be met by the operating environment if the solution is to be successfully deployed.*

* Use Case Modeling, by Bittner & Spence, page 79.

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Operating Requirements

Operating requirements include

1. System Requirements

2. Operating Environment requirements

* Use Case Modeling, by Bittner & Spence, page 79.

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System Requirements

System requirements necessary to support the

application, such as– Host operating systems– Network platforms– Configurations– Memory– Peripherals– Companion software– performance

Use Case Modeling, by Bittner & Spence, page 79.

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Operating Environment Requirements

For hardware-based systems– Location– Temperature– shock– Humidity

Use Case Modeling, by Bittner & Spence, page 80.

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Operating Environment Requirements

For software applications– Usage conditions– User environment– Resource availability– Maintenance issues– Error handling– Back up and Recovery

Use Case Modeling, by Bittner & Spence, page 80.

Operating Environment for one Business Area: Customer Support

Operating Environment Requirements Exercise

Each group member is to develop 3 operating environment requirements for their Business area

The team is to develop 3 overall operating environment requirements for JAT.

The individual operating requirements plus the overall operating requirements are to be added to section II, E, of the PID. The team is responsible for ensuring that there is no duplication in the PID.