Requirements types. Module 2 презентация

Requirements sources
Levels and types of requirements
Functional requirements
Nonfunctional requirements
Explicit and Implicit requirements
AGENDA

Requirements sources
HOW TO GET
AN EFFECTIVE
SOFTWARE
REQUIREMENTS?

Discovery
Requirements sources
Gathering
Analysis
Validation
Documentation

Requirements sources
Stakeholders
Existing documents
Existing systems

Requirements sources
Users
Customer
Sponsor
Market
Stakeholders

Requirements sources
Existing documents
Interface documentation
Strategy
Legal restrictions
Design documentation
Standards
Technical implementation
Constraints

Requirements sources
Existing systems
Adjacent system
Previous versions
Reports
Trouble tickets

Elicitation Techniques
Workshops
Interviews
Discussions
Document analysis
Prototyping
Interface
Identification
Marketing Survey and User Questionnaires
Observing users at work

Elicitation Techniques
Workshops
Interviews
Discussions
Document analysis
Prototyping
Interface
Identification
Marketing Survey and User Questionnaires
Observing users at work
Quality
Control
implementation and testing
Elicitation Techniques
Workshops
Interviews
Discussions
Document analysis
Prototyping
Interface
Identification
Marketing Survey and User Questionnaires
Observing users at work
Testing
Quality control

Levels and Types of requirements
BUSINESS REQUIREMENTS
USER REQUIRMENTS
FUNCTIONAL REQIURMENTS
Business Level
User Level
Product Level
Functional
WHY?
WHAT?
WHAT?

Levels and Types of requirements
BUSINESS REQUIREMENTS
USER REQUIRMENTS
FUNCTIONAL REQIURMENTS
Business Level
User Level
Product Level
Functional
BUSINESS RULES
Nonfunctional
QUALITY ATTRIBUTES
EXTERNAL INTERFACE REQUIREMENTS
CONSTRAINES

Levels and Types of requirements
BUSINESS REQUIREMENTS
USER REQUIRMENTS
FUNCTIONAL REQIURMENTS
Business Level
User Level
Product Level
Functional
BUSINESS RULES
Nonfunctional
QUALITY ATTRIBUTES
EXTERNAL INTERFACE REQUIREMENTS
CONSTRAINES

Levels and Types of requirements
BUSINESS REQUIREMENTS
USER REQUIRMENTS
FUNCTIONAL REQIURMENTS
Business Level
User Level
Product Level
BUSINESS RULES
Nonfunctional
QUALITY ATTRIBUTES
EXTERNAL INTERFACE REQUIREMENTS
CONSTRAINES
Functional

Business Level
User Level
Product Level
Levels and Types of requirements
"OMS application should reduce errors and increase efficiency
by automating the process of creating, managing and delivering orders "
“Customer should be able to create a new order”
“Merchandiser should be able to check information about orders"
“OMS application should have ‘Ordering’ tab for sorting, searching and filtering existing orders and for creating new orders.

Traceability
is a technique that provides a relationship between different levels of requirements in the system
Traceability between Requirements

Traceability plays several important roles:
Verifying that an implementation fulfills all requirements.
Verifying that the application does only what was requested.
Impact analysis
Helping with change management
Traceability between Requirements

Nonfunctional Requirements
Business
Rules
Quality
Attributes
External
Interfaces
Requirements
Design and
Implementation
Constraints
Corporate policies, Government regulations, Industry standards, Computational algorithms
Usability, Portability, Integrity, Efficiency, Robustness
Description of all inputs into and outputs from the software
Specific technologies, tools, programming languages, which should be used in the system implementation

Explicit
Explicit and Implicit Requirements
Hidden or ‘assumed’ and not stated explicitly
Clearly defined and documented
Explicit
Implicit

Explicit and Implicit Requirements
Password encryption
Auto complete
Short keys
Default behavior of UI controls

Requirements types. Example
Requirement Types. Example
User Requirements
Business Requirements
Functional Requirements
Nonfunctional Requirements

REQUIRMENT TYPES. EXAMPLE
User Requirements
Business Requirements
Functional Requirements
Nonfunctional Requirements
tOn he 'Login' page, pressing 'Enter' key should have the same effect as clicking on 'Login' button
and pressing 'Esc' key as clicking 'Reset' button
Implicit Requirements