SOFTWARE

What is system software?

A set of instructions to perform specific tasks is called a program, and the collection of one or many programs for a specific purpose is termed as computer SOFTWARE.

Types of SOFTWARE:

  1. System Software: e.g. OS, device drivers, translators, etc.
  2. Application Software: e.g. Text/Image Doc, Multimedia, etc.
  3. Utility Software: e.g. Anti-virus, firewalls, disk utilities, etc.

Software Characteristics

According to the IEEE 829 standard, a software feature is defined as a distinguishing characteristic of a software item.

Operational characteristics:

Correctness, usability/learnability, integrity, reliability, efficiency, security, and safety

Transitional characteristics:

Interoperability, reusability, and portability

Revision characteristics:

Maintainability, flexibility, extensibility, testability, modularity

SOFTWARE HIERARCHY

SOFTWARE HIERARCHY

USER

Application Programs

High-level languages programs and compilers

Operating Systems

Assembly Language Programs and assemblers

Machine Level Programs

HARDARE

Software Hierarchy
SOFTWARE HIERARCHY

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