a. Definition of Audit Evidence:
Audit evidence refers to information used by the auditor in arriving at conclusions on which their opinion is based. It includes information from the accounting records underlying the financial statements and other information obtained from other sources. Auditors require such evidence to support their conclusions about whether the financial statements present a true and fair view. Without sufficient and appropriate audit evidence, the auditor cannot express a reliable opinion.

Justification for Requiring Audit Evidence:
Auditors rely on audit evidence to:

• Ensure the accuracy, completeness, and validity of the financial statements.
• Provide a basis for forming their audit opinion.
• Detect material misstatements due to fraud or error.
• Comply with relevant auditing standards, particularly ISA 500, which requires auditors to design procedures to obtain sufficient and appropriate evidence.

b. Sources of Audit Evidence:
i. External Confirmations:
Audit evidence obtained from independent external sources, such as bank confirmation letters or supplier statements, is highly reliable as it is free from management influence.

• Effect on Auditor’s Reliance: Higher reliability due to independence.

ii. Internal Documents:
Documents such as minutes of meetings or internal memos are generated within the entity and may be less reliable if the internal controls are weak.

• Effect on Auditor’s Reliance: Less reliable unless supported by strong internal controls.

iii. Physical Observation:
Evidence gathered by the auditor through physical inspection or observation, such as inventory counts, is highly reliable because it is obtained directly by the auditor.

• Effect on Auditor’s Reliance: More reliable because the auditor has direct involvement.

iv. Management Representations:
This is the least reliable form of audit evidence and should only be used when corroborated by other evidence. It involves statements provided by management.

• Effect on Auditor’s Reliance: Low reliability due to potential bias from management.

c. Attributes of Audit Evidence:
i. Sufficiency:
Sufficiency refers to the quantity of evidence needed to form a conclusion. The auditor must judge the adequacy of the evidence, considering factors like audit risk and the nature of the entity.

ii. Relevance:
Relevance means the evidence must be related to the specific financial statement assertion under audit. For example, evidence regarding inventory valuation is relevant when testing the completeness assertion for stock.

iii. Reliability:
Reliability is the extent to which the auditor can depend on the evidence. External evidence is generally more reliable than internal evidence, and original documents are more reliable than copies.