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Chapter 6 3 4
Computer assisted audit techniques
Test data
Use Test the computerised controls
within the system
Description Data is put into the client’s
system
Auditor can see if the system
correctly processes it
Data may be real or dummy
System testing may be done in a
live environment or using a copy
of the client’s system
Examples The auditor enters data e.g.
 A timesheet with hours
outside the normal range to
check that the system
rejects it.
 A customer order that will
exceed the credit limit to
ensure the system rejects it. 
Advantages  Enables the auditor to test
programmed controls which
wouldn't otherwise be able
to be tested.
 Once designed, costs
incurred will be minimal
unless the programmed
controls are changed
requiring the test data to be
redesigned.
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Audit software
Substantive testing
Basic data analysis
Client data is analysed using
the auditor’s software
Auditor can check calculations
Auditor can identify items for
testing quickly and easily
 Re-performance of
addition or ageing of
invoices
 Identifying items for
testing e.g. identify credit
balances on the
receivables ledger
Preparation of reports
 Calculations of ratios
 Sample selection
 Calculations and casting
of reports will be quicker.
 More transactions can be
tested
 Computer files rather
than printouts are tested
 Cost effective once set
up