Requirement Patterns

PABRE-Man & PABRE-Proj

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Outline• Requirement Reuse• Requirement Pattern Example• PABRE Method• Tools:

PABRE-Man: Requirement Pattern Management PABRE-Proj: Project Management

Req. Patterns: PABRE-Man & PABRE-Proj

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Requirement ReuseReq. Patterns: PABRE-Man & PABRE-Cft

ReusableRequirements

Your Context

Common problem thatoccurs within the domain,and a suggested solution

Recognize which existing requirements apply to the

particular context

RequirementsBook

RequirementPatterns (SRPs)

PABREMethod

requirementsin naturallanguage

↓ global errors

↑quality of the individual requirements

Recognize which existing patterns apply to the

particular context

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SRP Example: Failure AlertsReq. Patterns: PABRE-Man & PABRE-Cft

The solution should alert of disks close to their capacity .

In case of a network or server disk crash, the solution should alert immediately.

The system should alert the administrator of the resources (physical or logical) close to their capacity.

failuresSet : set of possibleFailureso possibleFailures: server crash | disk crash …

The system shall trigger alerts in case of failuresSet failures.

alert

alert

alert

disks close to their capacity

network or server disk crash

resources (physical or logical)close to their capacity

Pattern’s Goal: Having system that provides alerts when system failures occur.

Requirement template

How do their requirements look like?

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SRP Example: Failure AlertsReq. Patterns: PABRE-Man & PABRE-Cft

Requirement Pattern Failure Alerts

Goal: Satisfy the customer need of having a system that provides alerts when system failures occur.

RequirementForm Homogeneous Failure Alerts

Fixed Part

Template The system shall trigger an alert in case of failure.

Extended Parts Constraint

multiplicity(Alerts Types) = 0..1 andmultiplicity(Failure Types) = 0..1

Extended Part Alert Types

Template The solution shall trigger %alertsSet% alerts in case of failure Parameter Metric

alertsSet alertsSet: Set(AlertType)AlertType: SMS | Mail | Fax | Sound ….

Extended Part Failure Types

Template The system shall trigger alerts in case of %failuresSet% failures Parameter Metric

failuresSet failuresSet: Set(FailureType)FailureType: server crash | disk crash …

RequirementForm Heterogeneous Failure Alerts

Fixed Part

TemplateThe system shall trigger different types of alerts depending on the type of failure.

Extended Parts Constraint

Multiplicity(Alerts for Failure Types) = 0..*

Extended Part Alerts for Failure Types

Template The system shall trigger %alertsSet% alerts in case of %failuresSet% failures.

Parameter Metric

alertsSet alertsSet: Set(AlertType)AlertType: SMS | Mail | Fax | Sound ….

failuresSet failuresSet: Set(FailureType)FailureType: server crash | disk crash …

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PABRE Method: Overview (I)• PABRE: PAttern Based Requirements Elicitation

• Method to use and update Req. Patterns

• Goals: Requirements Book Generation Requirements elicitation phase easier:

• ↓ time• ↓ errors

Req. Patterns: PABRE-Man & PABRE-Cft

↓ cost

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PABRE Method: Overview (II)Req. Patterns: PABRE-Man & PABRE-Cft

Requirements Elicitation

IT Consultant Customer

Supplier SupplierSupplier

Requirements

Book

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Knowledge of the Reqt. pattern

catalogue

Reqt.Patterns

Catalogue

FeedbackRepository

Call for tenders

CatalogueEvolution

RequirementsExpert

OTS-basedSolution

Needs

PatternsExploration

FormsExploration

PartsExploration

Requirem.Extraction

Requirem.Creation

Knowledge of previous projects

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Requirements Elicitation

IT Consultant Customer

Supplier SupplierSupplier

Requirements

Book

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Knowledge of the Reqt. pattern

catalogue

Reqt.Patterns

Catalogue

FeedbackRepository

Call for tenders

CatalogueEvolution

RequirementsExpert

OTS-basedSolution

Needs

PatternsExploration

FormsExploration

PartsExploration

Requirem.Extraction

Requirem.Creation

Knowledge of previous projects

PABRE Method: UseReq. Patterns: PABRE-Man & PABRE-Cft

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PABRE Method: With Tools

Req. Patterns: PABRE-Man & PABRE-Cft

IT Consultant

Needs

Customer

Requirements

Bid

Supplier

Requirements

Book

Evaluation

OTS-basedsolution

AcquisitionAgreement

Bid BidRequirements Elicitation

ProjectsDB

Catalogue Evolution

Knowledge ofRequirement

Patterns

Knowledge ofRequirement

Patterns

Knowledge ofpreviousprojects

Knowledge ofpreviousprojects

Supplier Supplier

Call for tenders

RequirementPatterns

DB

RequirementsEngineeringApplication

Support

RequirementsEngineeringApplication

Support

PatternManagement Application

PatternManagement Application

Requirement Enginner

PABRE-PROJ tool

PABRE-MAN tool

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PABRE-Man: Main functionalities• SRP repository management

Classification Schemas SRPs Metrics

• SRP repository exploration Browsing SRP catalogue according to different classification

schemas

• SRP use Statistics about the use of patterns with the aim to update

the SRP catalogue

• SRP catalogue exportation

Req. Patterns: PABRE-Man & PABRE-Cft

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PABRE-Man: OverviewReq. Patterns: PABRE-Man & PABRE-Cft

Selecting Classification

Schema

Information of the Selected Element

(SRP)

Browsing SRP Catalogue

Creating a new SRP or Classifier

(when U.Compliance selected)

Browsing Metrics

Information of the Selected Element(Domain Metric)

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PABRE-Man: Editing a SRP (I)Req. Patterns: PABRE-Man & PABRE-Cft

Pattern Navigation Tree:Browsing Forms, Parts &

Parameters of the SRP

Tabs of the Selected Item in the Pattern Navigation Tree (SRP)

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PABRE-Man: Editing a SRP (II)Req. Patterns: PABRE-Man & PABRE-Cft

Tab of the Selected Item in the Pattern Navigation Tree (Part)

Requirement Text(with Parameters)

Table of Parameters

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PABRE-Proj: Main Functionalities• Projects Repository Management

Projects Project Requirements:

• Created as an instance of a SRP• Created from scratch

• Project and SRP Repository Browsing Browsing of SRP Repository:

• By priorization• By classification schema

• Requirement Books Generation

Req. Patterns: PABRE-Man & PABRE-Cft

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PABRE-Proj: OverviewReq. Patterns: PABRE-Man & PABRE-Cft

Options over a Project

Information of the Selected Element

(Project)

Creating a new Project(when Alphabetical List selected)

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PABRE-Proj: Editing a project (I)Req. Patterns: PABRE-Man & PABRE-Cft

Browsing SRP Catalogue

Information of the Selected Element

(Part)

Project Navigation Tree:Browsing

Project Requirements

Tabs of the Selected Item in the Project Navigation Tree (Project) Current Tab: Project’s

General Information

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PABRE-Proj: Editing a project (II)Req. Patterns: PABRE-Man & PABRE-Cft

Current Tab: Project Requirement Overview

Creating Requirements (I)

Creating Requirements (II)

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PABRE-Proj: Editing a SRP requirementReq. Patterns: PABRE-Man & PABRE-Cft

Tabs of the Selected Item in the Project Navigation Tree

(Requirement that applies an SRP)

Giving value to a parameter

(Set of Domain)

Requirement’s Text(with parameters)

Info of the applied SRP

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PABRE-Proj: Editing a new requirementReq. Patterns: PABRE-Man & PABRE-Cft

Tabs of the Selected Item in the Project Navigation Tree

(New Requirement)

Requirement’s Question & Text completely free

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PABRE-Proj: Prioritizing SRPsReq. Patterns: PABRE-Man & PABRE-Cft

Browsing SRP Catalogue

Information of the Selected Element

(SRP)

Adding/Removing the Selected SRP

to/from the Prioritized List

Prioritized List of SRPs

Information of the Selected

SRP

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PABRE-Proj: Browsing SRP catalogueReq. Patterns: PABRE-Man & PABRE-Cft

2 Different Types of Browsing

Creating a new associated requirement to this form

Creating a new require-ment applying this part

Window to Apply a Part

Creating a new requirement in the

classifier of this SRP

Going to the next SRP in the

prioritized list

Creating a new associated requirement to this SRP

Comments and Questions