Presentaion on LOC matric and Function Point Matric for Software Engineering

1. LOC Matric
Function Point Matric
Presented By
Ankush Singh

2. Software Metric
lA software metric is a quantitative measure of a
degree to which a software system or process
posesses some property.
lThe goal is obtaining objective, reproducible and
quantifiable measurements, which may have
numerous valuable applications in schedule and
budget planning, cost estimation, quality
assurance testing, software debugging, software
performance optimization, and optimal personnel
task assignments.

3. 2 Popular Metrics
lTwo popular metrics used to estimate the size of
software project :
lLine Of Code (LOC)
lFunction Point (FP)

4. Line Of Code Metric
lLOC matric is a software metric used to measure
the size of a computer program by counting the
number of lines in the text of the program's source
code.
lLines used for commenting the code and header
file are ignored.
lLOC is typically used to predict the amount of
effort that will be required to develop a program,
as well as to estimate programming productivity or
maintainability once the software is produced.

5. Types of LOC
lTwo major types of LOC :
lPhysical LOC
lNo. of line of code
lLogical LOC
lNo. of executable statements.

6. Physical LOC
lPhysical LOC is the count of lines in the text of
the program's source code including comment
lines.
lBlank lines are also included unless the lines of
code in a section consists of more than 25% blank
lines.

7. Logical LOC
Logical LOC attempts to measure the number of
executable statements, but their specific
definitions are tied to specific computer
languages.
Example: Logical LOC measure for C-like
programming languages is the number of
statement-terminating semicolons(;).

8. Difference
1) PLOC = 1
1)LLOC = 2
1) PLOC = 5
1)LLOC = 2

9. Advantage
lScope for Automation of Counting
lAn Intuitive Metric
lUbiquitous Measure

10. Disadvantage
lLack of Accountability
lLack of Cohesion with Functionality
lAdverse Impact on Estimation
lDeveloper’s Experience
lPsychology

11. Function Point Matric

12. Function Point Matric
lFunction points measure software size.
lA function point is a unit of measurement to
express the amount of business functionality an
information system (as a product) provides to a
user.
lFunction points were defined in 1979 in
Measuring Application Development Productivity
by Allan Albrecht at IBM.

13. FP Matrics
lThe functional user requirements of the software
are identified and each one is categorized into one
of five types:
linputs,
loutputs,
linquiries,
linternal files, and
lexternal interfaces

14. Functional Requirements of
Software
lInputs : Each data item given by user except user
inquiries.
lOutput : Reports printed, Screen output, error
message produced etc.
lInquiries : Inquiries are user command whic
require specific action by user.
lInternal Files : It contains data structure and
physical files.
lExternal Interfaces : Interfaces are used to
exchange information with external system or
external data source eg. : CD-ROM

15. Function Point
lIt is computed in three step:
lComputing Unadjusted Function Point (UFP)
lRefining to show the complexity of UFP
lRefining each FP characteristic to to influence the
development effort of project.
lUFP = (Inputs)*4 + (Outputs)*5 + (Inquiries)*4 +
(Files)*10 + (Interfaces)*10