The person entering the
data simply reads through
what they have entered to
check it is correct or not.
Usually checked with the
original copy.
Double-Entry
The data is entered twice.
The computer compares the
data, and anything that
doesn't match is questioned.
Data
Validation (Is it
logical?)
Presence- Check
It is a check
to see if the
data is
entered.
E.G: You forgetting to
type
ponylover43@yahoo.com.sg
in the E-mail section. Then
there is a warning that
says you need to type it
in.
This is
too basic
for an
answer.
Better
not
write it
as an
answer.
Format-Check
It checks whether the
data is in the correct
format.
E..G:date
should be in
DD/MM/YYYY
(Not like USA)
Check-Digit
Used for numerical
data. An extra digit
is added to a
number which is
calculated from the
digits. The
computer checks
this calculation
when data are
entered
E.G:
IDK
Character-Type
Check
Character type
check is a check to
make sure only
certain types of
characters are in
the data.
E.G: A name should not have
numbers.
Range-Check
A range check is a
check to make sure
a number is within
a certain range.
E.G: A driver's age should be 17 to 99.
When you fake your birthday and
you still are not old enough for
Facebook.
Data Process
Batch Processing
Batch processing is where the data is
collected first, and then at a certain
period of time, usually after a month,
the data will be updated.
Real-time Process
Real-time
Processing is
where the data is
collected and
updated on the
spot.
Data Collection
Open-Loop
Sensor
Analog to Digital
Converter(ADC)
Computer
The sensor detects a change in
value. Then, it will send a signal
to the ADC, which will convert
the signal from analog to digital
for the computer to interpret.
Then it will send a signal to the
computer. The computer will
display the signal, showing that
there is a change in the value.