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Reliability
· = Consistency
· If something is measured more than once the
same effect should result.…read more

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Internal Reliability
· = a measure of the extent to which something
is consistent within itself.
· Eg. a tape measure should measure the same
distance between 10-20 cm and 20-40cm.…read more

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Assessing Internal Reliability
· The split-half method ­ the extent to which two
halves of the same procedure provide similar
results.
· Eg. splitting the test into two halves after the data
has been obtained and comparing the results.
· If results are similar the procedure is thought to
be reliable.
· To improve internal reliability individual questions
will be removed and a comparison will be
completed to see if similarity can be increased.…read more

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External Reliability
· = a measure of consistency over different
occasions.
· Eg. when a test is carried out the results
should be the same if it was to be carried out
again at a later date.…read more

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Assessing External Reliability
· The test-retest method ­ the extent to which
a procedure can be easily replicated.
· Eg. presenting the same participants with the
same test on two different occasions and then
comparing the results.
· If the results are similar to procedure is
thought to be reliable.
· To improve reliability the procedure would
need careful revision.…read more

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