Software economics and cost models

Most software cost models can be abstracted into a function of 5 parameters. They are,

1. Size - It's indicate number of source instructions or the number of function points required to develop the functionality.
2. Process - It used to produce the end product, in particular the ability of the process to avoid rework, bureaucratic delays and communications overhead.
3. Personnel - Indicate the capabilities of software engineering personnel.
4. Environment - Indicate the tools and techniques available to develop the software.
5. Quality - It's indicate quality of the software including its features, performance, reliability, and adaptability.

Effort = (Personnel)(Environment)(Quality)(Size^Process)

Source: Software Project Management by Barry W. Boehm