MELJUN CORTES Information System

INFORMATION SYSTEMS
CONCEPT


INFORMATION SYSTEMS


 “a

measure of the quantity of data in a message”
(information theory context)
 “any data that is relevant or has some value”
(information systems concept)

Information Systems

Manual vs Computer-based
Information Systems
 Function-based vs Integrated
Information Systems
 Benefits of Integrated Information
Systems

Information





Data
 “any

sign, symbol, or measure, which is in a form
that can be directly captured by a computer or
machine”

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INFORMATION SYSTEMS


COMPONENTS OF INFORMATION SYSTEMS

Information Systems
 study

of information production, flow, and use
within organizations

a

combination of hardware, software, people,
procedures, and data that provides data processing
capabilities for a business or organization



Information Technology



Input



Output



Processing



Feedback

 the

development, installation, and implementation
of computer systems and applications

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MANUAL VS COMPUTER-BASED INFORMATION
SYSTEMS


Manual Payroll System


MANUAL VS COMPUTER-BASED INFORMATION
SYSTEMS


The Payroll Clerk

Computer-Based Payroll System


1. receives time sheets from supervisors,
2. retrieves each employee’s record file from the filing
cabinet,
3. calculates the gross wage manually with a calculator,
4. manually calculates all deductions to get the net wage,
5. manually types the pay cheque and stub, and
6. updates the payroll register (stores every detail of
wages paid, deductions made, etc) study of information
production, flow, and use within organizations.

The Payroll Clerk
1.
2.
3.

4.
5.
6.

processes the stored time-sheet details,
retrieves each employee’s record from database file,
calculates the gross salary,
calculates deductions,
prints the pay cheque, and
updates the payroll register.

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FUNCTION-BASED VS INTEGRATED
INFORMATION SYSTEMS


Function-based Information System
 intended

for the exclusive support of a specific
application area
 has its own set of database files, which start out
being the same but later become different as one is
updated but the others are not

FUNCTION-BASED VS INTEGRATED
INFORMATION SYSTEMS


Integrated Information System
 share

a common set of database files
 only one database file implies 0% redundancy and
100% data integrity
 Database Management System software is used as
a tool to integrate data and information flow
through an organization

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BENEFITS OF INTEGRATED INFORMATION
SYSTEMS
Better control as data redundancy can be
eliminated.
 Allows different departments within an
organization to coordinate their activities more
efficiently.
 Greater access to information as everyone on the
system has access to the latest up-to-date
information.
 More efficient software development as
programmers have to deal with only database file
structure for each database file.


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