A key principle of an effective privacy policy is that it should be written in enough detail to cover the majority of likely scenarios. This ensures that the policy provides clear guidance on how personal data is to be handled, making it easier for employees to understand and follow, and for customers to know how their data is being used. According to the IAPP, privacy policies need to be sufficiently detailed to address the range of situations that the organization may encounter, which helps in maintaining compliance with privacy laws and regulations.