- The economies of ALL developed nations are dependent on software.
- More and more systems are software controlled
- Software engineering is concerned with theories, methods and tools for professional software development. Expenditure on software represents a significant fraction of GNP in all developed countries
Software costs
- Software costs often dominate computer system costs. The costs of software on a PC are often greater than the hardware cost.
- Software costs more to maintain than it does to develop. For systems with a long life, maintenance costs may be several times development costs.
- Software engineering is concerned with cost-effective software development
Software products
- Generic products: Stand-alone systems that are marketed and sold to any customer who wishes to buy them
- Customized products: Software that is commissioned by a specific customer to meet their own needs
Frequently asked questions about software engineering
Essential attributes of good software
Software engineering
Software engineering is an engineering discipline that is concerned with all aspects of software production from the early stages of system specification through to maintaining the system after it has gone into use
Application types
- Stand-alone applications: run on a local computer and do not need to be connected to a network
- Interactive transaction-based applications: executed on a remote computer and are accessed by users from their own PCs or terminals
- Embedded control systems: software control systems that control and manage hardware devices
- Batch processing systems: business systems that are designed to process data in large batches.
- Entertainment systems: systems that are primarily for personal use and which are intended to entertain the user.
- Systems for modeling and simulation: systems that are developed by scientists and engineers to model physical processes or situations, which include many, separate, interacting objects.
- Data collection systems: systems that collect data from their environment using a set of sensors and send that data to other systems for processing.
- Systems of systems: systems that are composed of a number of other software systems.
Software engineering fundamentals principles
- Systems should be developed using a managed and understood development process. Of course, different processes are used for different types of software.
- Dependability and performance are important for all types of system.
- Understanding and managing the software specification and requirements (what the software should do) are important.
- Where appropriate, you should reuse software that has already been developed rather than write new software.
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