Answer:

VARIOUS measures are used in project size estimation. Some of these are:

Lines of Code

Number of entities in ER diagram

Total number of processes in detailed data flow diagram

Function points

1. Lines of Code (LOC): As the name suggest, LOC count the total number of lines of source code in a project. The units of LOC are:

Explanation:

KLOC- Thousand lines of code

NLOC- Non comment lines of code

KDSI- THOUSANDS of delivered source instruction

The size is estimated by comparing it with the existing systems of same KIND. The experts use it to predict the required size of various components of SOFTWARE and then add them to get the total size.

Advantages:

Universally accepted and is used in many models like COCOMO.

Estimation is closer to developer’s perspective.

Simple to use.

Disadvantages:

Different programming LANGUAGES contains different number of lines.

No proper industry standard exist for this technique.

It is difficult to estimate the size using this technique in early stages of project.