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IGCSE ICT Unit 15 Proofing with complete solution
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IGCSE ICT Unit 15 Proofing with complete solution
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IGCSEICT
Unit
15
Proofing
What
is
validation?
(3)
-
correct
answer-Checking
that
data
entered
is
reasonable
and
to
see
if
it
satisfies
certain
criteria
and
falls
within
accepted
boundaries.
Presence
check
-
correct
answer-Is
data
actually
present
in
a
field,
or
has
it
been
missed
out?
Range
Check
-
correct
answer-Is
the
data
value
within
a
set
range?
(E.g.
an
exam
mark
should
be
between
0%
and
100%,
a
month
should
be
between
1
and
12)
Length
Check
-
correct
answer-Is
an
item
of
text
too
short
or
too
long?
Type
Check
-
correct
answer-Is
the
data
the
correct
type?
(E.g.
the
letter
'A'
should
not
be
allowed
in
a
numeric
field)
Format
Check
-
correct
answer-Is
the
data
in
the
correct
format?
(E.g.
a
date
of
birth
should
be
entered
as
dd/mm/yyyy)
What
is
verification?
-
correct
answer-A
way
of
preventing
errors
when
data
is
copied
from
one
medium
to
another.
What
can
verification
do?
-
correct
answer-Reduce
the
errors
made
when
data
is
entered
into
the
computer.
Two
common
ways
of
verification
checks
-
correct
answer-Visual
checking
and
double
data
entry
Explanation
of
visual
verification
(checking)
-
correct
answer-Compare
the
original
paper
documents
with
the
data
entered
into
the
computer
Explanation
of
double
data
entry
(4
points)
-
correct
answer-Data
is
entered
into
a
system
twice
(often
by
two
different
people)
and
compared
by
the
computer
and
any
differences
in
the
data
is
flagged
as
an
error
and
can
be
correct
by
the
user.
Why
are
validation
and
verification
needed?
-
correct
answer-To
reduce
the
number
of
errors
in
data
entry
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