The document discusses a survey of 29 companies representing $35 billion in global media spend on their views and use of media auditing companies. Key findings include: - Most advertisers see auditors as indispensable partners that are crucial for measuring media value and will remain important in the future. - Digital media is seen as the key area for future development of auditor services. - Auditors are used extensively in Europe but their use is also rising in Asia and North America. However, the portion of digital budgets that auditors can measure remains low and may be declining in some regions. - The document provides some guidelines for advertisers to make the best use of auditors, including ensuring the right to audit