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Page 1: Requirements standards (usecase model) A use case is a technique used in software and systems engineering to capture the functional requirements of

Page 2: Requirements standards (usecase model) A use case is a technique used in software and systems engineering to capture the functional requirements of

Requirements standards (use-case model)A use case is a technique used in software and systems

engineering to capture the functional requirements of a system. Use cases describe the interaction between a primary actor—the initiator of the interaction—and the system itself, represented as a sequence of simple steps. Actors are something or someone which exist outside the system under study, and who (or which) take part in a sequence of activities in a dialogue with the system, to achieve some goal: they may be end users, other systems, or hardware devices. Each use case is a complete series of events, from the point of view of the actor.

(Wikipedia - http://en.wikipedia.org/wiki/Use_case)

Page 3: Requirements standards (usecase model) A use case is a technique used in software and systems engineering to capture the functional requirements of

Requirements standards (IEEE)<Condition> <user> <shall || should || may>

<action>

Condition: optionalUser: external or internal, usually singularSee RFC 2116 (http://www.ietf.org/rfc/rfc2119.txt)

Shall: Mandatory, “definition is an absolute requirement of the specification.”

Should: Recommended, “there may exist valid reasons in particular circumstances to ignore a particular item”

May: OptionalAction: usually singular

Page 4: Requirements standards (usecase model) A use case is a technique used in software and systems engineering to capture the functional requirements of

Standard vs. feature list vs. functional requirementStandard:

IntuitiveFeature:

Have different levelsFunctional requirement(s):

Armadillo Run shall have 15 levels.Design requirement(s):

A level class shall have an IDENTITY attributeAn IDENTITY attribute shall be an integer

Page 5: Requirements standards (usecase model) A use case is a technique used in software and systems engineering to capture the functional requirements of

Words/phrases to avoidAppropriatelyEssentiallyAbout/approximatelyA fewQuicklySlowlyAverage (adjective

not noun or verb)Realistic

Designated amount of time

Will make sure

Page 6: Requirements standards (usecase model) A use case is a technique used in software and systems engineering to capture the functional requirements of

Term Grid 1 2 3 4 5 6 7 8 9 108:05 9:00 9:55 10:50 11:45 12:40 1:35 2:30 3:25 4:20

Monday

CSSE375-01O101 Lunch

Tuesday

CSSE375-01O101 Team C Lunch

Wednesday Team A Team G

Thursday

CSSE375-01O101 Team J Team E Lunch Team L

Friday

CSSE375-01O101 Lunch

Department meeting

[email protected]

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