What is the most significant factor in determining data collection extent during IS compliance audit planning?

The most significant factor in determining the extent of data collection during IS compliance audit planning is the purpose, objective, and scope of the audit. This is crucial because these elements define what the audit seeks to accomplish and set the boundaries for the entire audit process. For instance, if the audit's purpose is to assess compliance with specific regulations or industry standards, the data collected will focus primarily on areas pertinent to those requirements.

Additionally, the objectives will guide the auditor on what specific aspects of the information system need to be scrutinized, thus influencing the data collection strategies. The scope outlines the limits of the audit, including which systems, processes, or locations will be assessed. A well-defined scope ensures that auditors concentrate their resources effectively and collect relevant data that directly address the audit's goals.

Incorporating these considerations ensures that the audit is not only efficient but also comprehensive, leading to more insightful results and actionable recommendations. Overall, aligning data collection efforts with the audit's purpose, objective, and scope is fundamental to achieving the desired outcomes and ensuring compliance.