Which principle states that information should be adequate, relevant, and not excessive for a specified purpose?

The principle that specifies that information should be adequate, relevant, and not excessive for a specified purpose is known as the Principle of Proportionality. This principle emphasizes that any data collected must correspond directly to the needs and requirements of the specific purpose for which it is being gathered.

In this context, adequacy refers to having enough information to fulfill the purpose, relevance means the information should pertain directly to the intended use, and not being excessive means that only the minimum necessary information should be collected. This principle aims to protect individuals from unnecessary data processing and ensures that privacy rights are respected by limiting the scope of information gathering to what is essential.

The other principles, while related to data privacy, focus on different aspects of data handling. The Principle of Legitimate Purpose relates to ensuring that data collection serves a legitimate reason, the Principle of Relevance highlights the importance of data being pertinent to the matter at hand, and the Principle of Reasonable Extent discusses the limits of data collection in terms of volume or scope, but does not encapsulate the requirements of adequacy, relevance, and non-excessiveness in a comprehensive way like the Principle of Proportionality does.