284685
Advantages and
Disadvantages
Input Devices (1)
- Disadvantages
- Barcode Reader
- data on barcode
can not be edited
- data on barcode
can not be edited
- Digital Camera
- Image files can
be memory
heavy
- Quality of output will
depend on quality of
printer and paper
- Image files can
be memory
heavy
- Keyboard
- Data entry is
time
consuming
and
dependent
on typing
skills
- They can
contribute to
repetitive strain
injury if
overused
- Data entry is
time
consuming
and
dependent
on typing
skills
- Magnetic Ink
Character
Reader
- Its use is in
decline
- Its use is in
decline
- Smart Cards
- Can be stolen
- Can be stolen
- Pointing
Device
- Experts tend
to use
keyboard
short cuts
- Hand-eye
coordination is an
issue for some users
- Experts tend
to use
keyboard
short cuts
- Optical
Character
Reader
- Can misread letters so
has to be proof-read
afterwards
- Not good at capturing
hand-written text. Also
document must not contain
any marks or smudges that
could be interpreted as
characters
- Can misread letters so
has to be proof-read
afterwards
- Optical Mark
Reader
- The input forms necessarily
limit the range of permissible
responses
- Incorrect marking
of the sheet will
lead to the data
being rejected
- The input forms necessarily
limit the range of permissible
responses
- Sensors
- They are limited
in the type of data
they can collect
- They can misread
the environment
- They are limited
in the type of data
they can collect
- Touch
Screens
- They are limited as
input devices because
only a limited number
of values can be
displayed at once
- They are limited as
input devices because
only a limited number
of values can be
displayed at once
- Speech Input
- Interpreting human
language us a complex
process because meaning
can be ambiguous
- The human voice is
not uniform, we all
have different accents
which the software has
to adapt to
- Interpreting human
language us a complex
process because meaning
can be ambiguous
- Barcode Reader
- Advantages
- Barcode Reader
- Fast input method
- Accurate
- Fast input method
- Digital Camera
- The image can be
used flexibly in a wide
range of applications
- Can be modified
using special
software
- Can be attached as a file in email
- The image can be
used flexibly in a wide
range of applications
- Keyboard
- Most common
method of inputting
text based data
- Most common
method of inputting
text based data
- Magnetic Ink
Character Reader
- quick and efficient
- humans can make
sense of data as well
as machines
- resistant to forgery
- quick and efficient
- Smart Card
- increasingly
used for
transactions
- contain more data and
are robust and more
secure
- increasingly
used for
transactions
- Pointing Devices
- Barcode Reader
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