software requirement elicitation
TRANSCRIPT
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Software Requirement Elicitation
- Aime -
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Content
● What is Requirement Elicitation?● Why? - Importance of Requirement
Elicitation● Challenges of Requirement
Elicitation● Types of Requirement● 5 Steps to Extract Requirement● Applying with Agile● Requirement Management and Tool
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WHAT
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IS
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“Requirement Elicitation”
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“Requirement Analysis”
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Requirements vs Constraints
describe what we want to happen
describe real-world limits or boundaries around what we want to happen
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SRSSoftware Requirement Specification
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Introduction
Overall Description
Specific Requirement
Functional Requirement
Non-Functional Requirement
User Interface
Glossary
Content of SRS
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WHY
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Important of Software Requirement Elicitation
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Different users have differents requirement
37% of software development failure is on requirement
“Many Project fail because of wrongly identified or inadequately stated requirement”
“The hardest single part of building a software system is deciding precisely what to build”
Importance of Software Requirement Elicitation
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Software development in general is a wicked problem
Customer and users do not know what software can do and can not express their needs
Communication barrier between customer/user and development team
Non-functional requirement are not identified or understated
Requirement Change ...
Challenges of Software Requirement Elicitation
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TYPEof Requirement
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MUST, SHALL, WILL
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FunctionalRequirement
Non-FunctionalRequirement
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FunctionalRequirement
Non-FunctionalRequirement
Performance Requirement
Quality Requirement
Safety Requirement
Security Requirement
Interface Requirement
ETC.
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Non-Functional Requirement - Performance
“rental service must responses the request to user within 0.5 milliseconds”
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Non-Functional Requirement - Quality
“The service must be available to response 99% of time”
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Non-Functional Requirement - Safety
“The system must save the transaction and can recover history transaction if it fails”
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Non-Functional Requirement - Security
“The system must encrypt all data that transmit over the internet”
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Non-Functional Requirement - Interface
“Rent button must be red and lighter when cursor is hovering on it”
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5 STEPsfor Software Requirement Elicitation
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1. Collecting Information
2. Constructing model
3. Deriving requirement & constraint
4. ConductingFeasibility Study
5. Review
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1. Collecting Information
2. Constructing model
3. Deriving requirement & constraint
4. ConductingFeasibility Study
5. Review1. Collecting Information
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Step 1 : Collecting Information
1. What information needs to be collect?
2. What are the available information-collection method and techniques?
3. What are the guideline for information gathering
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Step 1 : Collecting Information - Cont.
Information-Collection Activity should aim to acquire :
● Information about application● Business Process● Application Domain
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Step 1 : Collecting Information - Cont.
Information-Collection Techniques
● Customer Presentation● Literature Survey● Study of Existing Business Procedure and Forms● Stakeholders Survey● User Interviewing● Writing User Stories
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Step 1 : Collecting Information - Cont.
User Story Form
“As a ______, I want to ________”
User Story Example
“As a manager, I want to assign each part of work to each specific employee”
“As a manager, I want to broadcast weekly schedule too all employee”
“As an employee, I want to contact with manager via personal message”
“As an employee, I want to commute with other employee via Live Chat”
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1. Collecting Information
2. Constructing model
3. Deriving requirement & constraint
4. ConductingFeasibility Study
5. Review
2. Constructing model
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Step 2 : Constructing Model
“REAL WORLD APPLICATION ARE
COMPLEX”
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Step 2 : Constructing Model
CLASS DIAGRAM
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Step 2 : Constructing Model
USE CASE DIAGRAM
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Step 2 : Constructing Model
SEQUENCE DIAGRAM
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Step 2 : Constructing Model
STATE DIAGRAM
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Step 2 : Constructing Model
ACTIVITY DIAGRAM
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1. Collecting Information
2. Constructing model
3. Deriving requirement & constraint
4. ConductingFeasibility Study
5. Review
3. Deriving requirement & constraint
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Step 3 : Deriving Requirements & Constraints
Information have to be analyzed to satisfy the needs.
Identifying Needs from the Wishlists
Identifying Needs to Satisfy Business Goals
Deriving Requirement from Needs
Deriving Requirement from Analysis Model
Numbering Requirements and Constraints
Prioritizing Requirements
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1. Collecting Information
2. Constructing model
3. Deriving requirement & constraint
4. ConductingFeasibility Study
5. Review
4. ConductingFeasibility Study
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Step 4 : Conducting Feasibility Study
Team Ability Budget Schedule
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1. Collecting Information
2. Constructing model
3. Deriving requirement & constraint
4. ConductingFeasibility Study
5. Review5. Review
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Step 5 : Reviewing Requirement Specification
Technical Review Expert Review Customer Review
● Incompleteness● Inconsistency● Ambiguity● Redundancy● Intractability● Infeasibility
● Incorrectness● Inaccurate● Inappropriate● Inconsistent● Policy● Standard● Law● Rules● Behavior
● Correctness● Meet the needs● User Interface● All Function● All Non-Function
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AGILEApplying with
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AGILEWHY?
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AGILE REDUCE ...
COST TIME
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BECAUSE ...
Customer Collaboration Change Handling Modeling
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Requirements
&MANAGEMENTTOOLS
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Q&A