Metrics : It is the degree to which a system, component or process processes a given attribute. The software metrics relate several measures. For example: average number of errors found per review.

Direct Metrics: It refers to immediately measurable attributes. For example - line of code, execution speed.

Indirect Metrics: It refers to the aspects that are not immediately measurable. For example - functionality of the program.

Errors: These are the type of faults that are found by the developers during development of a software.

Defects: Defects means faults found by the customer after release.

Process Metrics

Process metrics are collected over all project and long period of time.

It allows a project manager:

• Access the status of ongoing project.

• Track the potential risks.

• Uncover the problem area before going to critical.

• Adjust the tasks.

• To control the quality of the software work products evaluate the project team's ability.

Project Metrics

• On most software projects the first application of project metrics occurs through the estimation.

• Metrics are collected from the previous projects act as base using which effort and time estimates are created for current software work.

• The time and effort are compared to original estimates as a project goes on.

• If the quality is improved then the defects are minimized and if the defect goes down, then the amount of rework needed during the project is also reduced