29. Function POints vs Object Points

hello all, 
remember we learnt the software estimation techniques . COCOMO and FP ? in another way COCOMO and FP can be taken as software measurements (metrics ) , here I am listing another metric ; object points below .

Function points

FP are a language independent way of expressing the functionality in a program. Productivity is expressed as the number of function points that are implemented per person-month. A function point is computed by combining several different measurements or estimates (see below)



You can then compute the so-called unadjusted function-point count (UFC) by multiplying each initial count by the estimated weight and summing all values. The unadjusted function-point count is then readjusted and yield final function-point count for the overall system.

problems
unction-point count in a program depends on the estimator. Different people have different notions of complexity.

Object Points (Application Points )

Application points are an alternative to function points. Object points are only concerned with screens, reports and modules in conventional programming languages. The advantage of application points over function points is that they are easier to estimate
The number of application points in a program is a computed using ,

• The number of separate screens that are displayed
• The number of reports that are produced.
• The number of modules in codes to be developed to supplement the database programming code

Problems
They are not concerned with implementation details and the complexity factor estimation is much simpler

When you have free time (perhaps after exams ) read this for more information : http://fattocs.com/en/resources/faq
Source : https://ifs.host.cs.st-andrews.ac.uk/Books/SE9/Web/Planning/FPs.html

Try this question : 
2016 Sep A1 -
b) Object Points and Function Points are general, high level system size metrics. Which aspects of the software system are taken into account in the Object Point metric, and which in the Function Point metric?