Software design is a process by which the software requirements are translated into a representation of software components, interfaces, and data necessary for the implementation phase. The SDD shows how the software system will be structured to satisfy the requirements. It is the primary reference for code development and, therefore, it must contain all the information required by a programmer to write code. The SDD is performed in two stages. The first is a preliminary design in which the overall system architecture and data architecture is defined. In the second stage, i.e. the detailed design stage, more detailed data structures are defined and algorithms are developed for the defined architecture.
This template is an annotated outline for a software design document adapted from the IEEE Recommended Practice for Software Design Descriptions. The IEEE Recommended Practice for Software Design Descriptions have been reduced in order to simplify this assignment while still retaining the main components and providing a general idea of a project definition report. For your own information, please refer to IEEE Std 1016-1998 for the full IEEE Recommended Practice for Software Design Descriptions.
Identify the purpose of this SDD and its intended audience. (e.g. “This software design document describes the architecture and system design of XX..”).
Provide a description and scope of the software and explain the goals, objectives and benefits of your project. This will provide the basis for the brief description of your product.
Provide an overview of this document and its organization.
This section is optional.
List any documents, if any, which were used as sources of information for the test plan.
This section is optional.
Provide definitions of all terms, acronyms, and abbreviations that might exist to properly interpret the SDD. These definitions should be items used in the SDD that are most likely not known to the audience.
Give a general description of the functionality, context and design of your project. Provideany background information if necessary.
Develop a modular program structure and explain the relationships between the modules to achieve the complete functionality of the system. This is a high level overview of how responsibilities of the system were partitioned and then assigned to subsystems. Identify each high level subsystem and the roles or responsibilities assigned to it. Describe how these subsystems collaborate with each other in order to achieve the desired functionality. Don’t go into too much detail about the individual subsystems. The main purpose is to gain a general understanding of how and why the system was decomposed, and how the individual parts worktogether. Provide a diagram showing the major subsystems and data repositories and their interconnections. Describe the diagram if required.
Provide a decomposition of the subsystems in the architectural design. Supplement with text as needed. You may choose to give a functional description or an object-oriented description.
For a functional description, put toplevel data flow diagram (DFD) and structural decomposition diagrams. For an OO description, put subsystem model, object diagrams, generalization hierarchy diagram(s) (if any), aggregation hierarchy diagram(s) (if any), interface specifications, and sequence diagrams here.
Discuss the rationale for selecting the architecture described including critical issues and trade/offs that were considered. You may discuss other architectures that were considered, provided that you explain why you didn’t choose them.
Explain how the information domain of your system is transformed into data structures.
Describe how the major data or system entities are stored, processed and organized. List any databases or data storage items.
Alphabetically list the system entities or major data along with their types and descriptions. If you provided a functional description, list all the functions and function parameters. If you provided an OO description, list the objects and its attributes, methods and method parameters.
In this section, we take a closer look at what each component does in a more systematic way. If you gave a functional description, provide a summary of your algorithm for each function listed in procedural description language (PDL) or pseudocode. If you gave an OO description, summarize each object member function for all the objects listed in PDL or pseudocode. Describe any local data when necessary.
Describe the functionality of the system from the user’s perspective. Explain how the user will be able to use your system to complete all the expected features and the feedback information that will be displayed for the user.
Display screenshots showing the interface from the user’s perspective. These can be hand-drawn or you can use an automated drawing tool. Just makethemas accurate as possible. (Graph paper works well.)
A discussion of screen objects and actions associated with those objects.
Provide a cross-reference that traces components and data structures to the requirements in your SRS document.
Use a tabular format to show which system components satisfy each of the functional requirements from the SRS. Refer to the functional requirements by the numbers/codes that you gave them in the SRS.
This section is optional.
Appendices may be included, either directly or by reference, to provide supporting details that could aid in the understanding of the Software Design Document.