Requirements provides the suitable mechanism for understanding what the customer wants, analyzing need, assessing feasibility, negotiating a sensible solution specifying the solution unambiguously, validating the specification, and managing the requirements as they are transformed into an operational system.
Requirements management is defined as a regular approach to eliciting, organizing and documenting the requirements of the system, and a process that establishes and maintains agreement between customer and project on the changing requirements of the system.
Types of Requirements
The requirements can be distinguished by using the terms
1) User Requirements: High-level abstract requirements, and
2) System Requirements: Detailed description of what the system should do.
System Requirements
Ø System requirements set out the system’s functions, services and operational constraints in detail. The system requirements document should be precise.
Ø They are intended to be a basis for designing the system.
Ø They may be included into the system contract.
Ø The readers of the system requirements need to know more precisely what the system will do because they are alarmed with how it will support the business processes or because they are involved in the system implementation. The readers of system requirements include:
· System end-users
· Client Engineers
· System Architects
· Software Developers
Types of System Requirements
Software system requirements are often classified as functional requirements, non-functional requirements or domain requirements:
1) Functional Requirements.
2) Non-Functional Requirements
3) Domain Requirements
Functional Requirements
Ø Functional requirements should explain all the necessary functionality or system services.
Ø The customer should supply statement of service. It should be clear how the system should respond to particular inputs and how a particular system should act in particular situation.
Ø Functional requirements are heavily dependent upon the type of software, expected users and the type of system where the software is used.
Ø Functional user requirements may be high-level statements of what the system should do but functional system requirements should explain the system services in detail.
Example: Functional Requirements
Consider a library system in which there is a single interface provided to multiple database. These databases are collection of articles from different libraries. A user can search for, download and these articles for a personal study.
From this example we can obtain functional requirements as:
1) The user shall be able to search either
2) The system shall provide suitable spectators for the user to read documents in the document store.
3) A unique identifier should be allocated to every order. This identifier can be copied by the user to the account’s permanent storage area.
Problem Associated with Expression of Functional Requirements
Actually in practice, it is impossible to produce a complete and consistent requirements document.
1) Requirements Imprecision
i. Problems arise when requirements are not precisely stated.
ii. Ambiguous requirements may be interpreted in different ways by developers and users.
iii. Consideration of ‘appropriate viewers’.
2) User Intention
Special purpose viewer for each different document type .
3) Developer Interpretation
Provide a text viewer that shows the contents of the document.
4) Requirements Completeness and Consistency
The requirements should be both complete and consistent. Complete means they should comprise metaphors of all facilities required. Consistent means there should be no conflicts or contradictions in the descriptions of the system facilities.
Non-Functional Requirements
Ø The non-functional requirements describe system properties and constraints. a variety of properties of a system can be: Reliability, response time, storage requirements. And constraints of the system can be: Input and output device capability, system representations, etc.
Ø Process requirements may also specify programming language or development method.
Ø Non-functional requirements are more critical than functional requirements. If the non-functional requirements do not meet then the complete system is of no use.
Types of Non-Functional Requirements
1) Product requirements: These requirements specify how a delivered product should behave in a particular way. For example, executions speed, reliability.
2) Organizational Requirements: The requirements which are consequences of organizational policies and procedures come under this category.
3) External requirements: These requirements arise due to the factors that are external to the system and its development process.
In short, non-functional requirements arise through:
i. User needs
ii. Because of budget constraints
iii. Organizational policies
iv. The need for interoperability with other software or hardware system, and
Because of external factors such as safety regulations.
software development in jaipur offer best software management and development services also provide website designing services in delhi and mumbai.
Requirements management is defined as a regular approach to eliciting, organizing and documenting the requirements of the system, and a process that establishes and maintains agreement between customer and project on the changing requirements of the system.
Types of Requirements
The requirements can be distinguished by using the terms
1) User Requirements: High-level abstract requirements, and
2) System Requirements: Detailed description of what the system should do.
System Requirements
Ø System requirements set out the system’s functions, services and operational constraints in detail. The system requirements document should be precise.
Ø They are intended to be a basis for designing the system.
Ø They may be included into the system contract.
Ø The readers of the system requirements need to know more precisely what the system will do because they are alarmed with how it will support the business processes or because they are involved in the system implementation. The readers of system requirements include:
· System end-users
· Client Engineers
· System Architects
· Software Developers
Types of System Requirements
Software system requirements are often classified as functional requirements, non-functional requirements or domain requirements:
1) Functional Requirements.
2) Non-Functional Requirements
3) Domain Requirements
Functional Requirements
Ø Functional requirements should explain all the necessary functionality or system services.
Ø The customer should supply statement of service. It should be clear how the system should respond to particular inputs and how a particular system should act in particular situation.
Ø Functional requirements are heavily dependent upon the type of software, expected users and the type of system where the software is used.
Ø Functional user requirements may be high-level statements of what the system should do but functional system requirements should explain the system services in detail.
Example: Functional Requirements
Consider a library system in which there is a single interface provided to multiple database. These databases are collection of articles from different libraries. A user can search for, download and these articles for a personal study.
From this example we can obtain functional requirements as:
1) The user shall be able to search either
2) The system shall provide suitable spectators for the user to read documents in the document store.
3) A unique identifier should be allocated to every order. This identifier can be copied by the user to the account’s permanent storage area.
Problem Associated with Expression of Functional Requirements
Actually in practice, it is impossible to produce a complete and consistent requirements document.
1) Requirements Imprecision
i. Problems arise when requirements are not precisely stated.
ii. Ambiguous requirements may be interpreted in different ways by developers and users.
iii. Consideration of ‘appropriate viewers’.
2) User Intention
Special purpose viewer for each different document type .
3) Developer Interpretation
Provide a text viewer that shows the contents of the document.
4) Requirements Completeness and Consistency
The requirements should be both complete and consistent. Complete means they should comprise metaphors of all facilities required. Consistent means there should be no conflicts or contradictions in the descriptions of the system facilities.
Non-Functional Requirements
Ø The non-functional requirements describe system properties and constraints. a variety of properties of a system can be: Reliability, response time, storage requirements. And constraints of the system can be: Input and output device capability, system representations, etc.
Ø Process requirements may also specify programming language or development method.
Ø Non-functional requirements are more critical than functional requirements. If the non-functional requirements do not meet then the complete system is of no use.
Types of Non-Functional Requirements
1) Product requirements: These requirements specify how a delivered product should behave in a particular way. For example, executions speed, reliability.
2) Organizational Requirements: The requirements which are consequences of organizational policies and procedures come under this category.
3) External requirements: These requirements arise due to the factors that are external to the system and its development process.
In short, non-functional requirements arise through:
i. User needs
ii. Because of budget constraints
iii. Organizational policies
iv. The need for interoperability with other software or hardware system, and
Because of external factors such as safety regulations.
software development in jaipur offer best software management and development services also provide website designing services in delhi and mumbai.