Operational audits are comprehensive reviews of the varied functions within the organization to appraise the efficiency and effectiveness with which those functions achieve their objectives.
Fraud audits identify the facts and circumstances of possible fraud or misappropriation of the organization's assets.
Financial audits are analyses of the economic activity of the organization as measured and reported by accounting methods.
Information Systems audits are analyses of effectiveness, efficiency, confidentiality, integrity, availability, compliance, and reliability of data and programs on computer and communication systems.
Compliance audits measure the adherence with company policies, procedures, governmental laws, regulations, sponsored grants, contract requirements, and donor restrictions on use of funds.