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SOFTWARE DESIGN SPECIFICATION
1.0 Introduction
This section provides an overview of the entire design document. This document describes all data, architectural, interface and component-level design for the software.
1.1 Goals and objectives
Overall goals and software objectives are described.
1.2 Statement of scope
A description of the software is presented. Major inputs, processing functionality, and outputs are described without regard to implementation detail.
1.3 Software context
The software is placed in a business or product line context. Strategic issues relevant to context are discussed. The intent is for the reader to understand the 'big picture'.
1.4 Major constraints
Any business or product line constraints that will impact he manner in which the software is to be specified, designed, implemented or tested are noted here.
2.0 Data design
A description of all data structures including internal, global, and temporary data structures.
2.1 Internal software data structure
Data structures that are passed among components the software are described.
2.2 Global data structure
Data structured that are available to major portions of the architecture are described.
2.3 Temporary data structure
Files created for interim use are described.
2.4 Database descriptio
Database(s) created as part of the application is(are) described.
3.0 Architectural and component-level design
A description of the program architecture is presented.
3.1 Program Structure
A detailed description the program structure chosen for the application is presented.
3.1.1 Architecture diagram
A pictorial representation of the architecture is presented.
3.1.2 Alternatives
A discussion of other architectural styles considered is presented. Reasons for the selection of the style presented in Section3.1.1 are provided.
3.2 Description for Component n
A detailed description of each software component contained within the architecture is presented. Section 3.2 is repeated for each of n components.
3.2.1 Processing narrative (PSPEC) for component n
A processing narrative for component n is presented.
3.2.2 Component n interface description.
A detailed description of the input and output interfaces for the component is presented.
3.2.3 Sub-Component n.m processing detail
A detailed algorithmic description for each sub-component within the component n is presented. Section 3.2.3 is repeated for each of the m sub-components of component n.
3.2.3.1 Interface description
A description of sub-component m inputs and outputs is presented.
3.2.3.2 Algorithmic model (e.g., PDL)
The pseudocode listing for sub-component m is presented.
3.2.3.3 Restrictions/limitations
The external environment and/or infrastructure that must exist for sub-component m to operate correctly is provided.
]3.2.3.4 Local data structures
The data structures used within sub-component m are presented.
3.2.3.5 Performance issues
Information on topics that may affect the run-time performance, security, or computational accuracy of this sub-component are presented.
3.2.3.6 Design constraints
Attributes of the overall software design (including data structures, OS features, I/O, and interoperable systems) that constrain the design of this sub-component are presented.
3.3 Software Interface Description
The software's interface(s) to the outside world are described.
3.3.1 External machine interfaces
Interfaces to other machines (computers or devices) are described.
3.3.2 External system interfaces
Interfaces to other systems, products, or networks are described.
3.3.3 Human interface
An overview of any human interfaces to be designed for the software is presented. See Section 4.0 for additional detail.
4.0 User interface design
A description of the user interface design of the software is presented.
4.1 Description of the user interface
A detailed description of user interface including screen images or prototype is presented.
4.1.1 Screen images
Representation of the interface form the user's point of view.
4.1.2 Objects and actions
All screen objects and actions are identified.
4.2 Interface design rules
Conventions and standards used for designing/implementing the user interface are stated.
4.3 Components available
GUI components available for implementation are noted.
4.4 UIDS description
The user interface development system is described.
5.0 Restrictions, limitations, and constraints
Special design issues which impact the design or implementation of the software are noted here.
6.0 Testing Issues
Test strategy and preliminary test case specification are presented in this section.
6.1 Classes of tests
The types of tests to be conducted are specified, including as much detail as is possible at this stage. Emphasis here is on black-box and white-box testing.
6.2 Expected software response
The expected results from testing are specified.
6.3 Performance bounds
Special performance requirements are specified.
6.4 Identification of critical components
Those components that are critical and demand particular attention during testing are identified.
7.0 Appendices
Presents information that supplements the design specification.
7.1 Requirements traceability matrix
A matrix that traces stated components and data structures to software requirements is developed.
7.2 Packaging and installation issues
Special considerations for software packaging and installation are presented.
7.3 Design metrics to be used
A description of all design metrics to be used during the design activity is noted here.
7.4 Supplementary information (as required)
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