What are the compliance validation reporting requirements for merchants?

Under the new PCI standard, the compliance validation requirements of the old VISA CISP and MasterCard SDP programs have been aligned so that merchants need only validate their compliance once to fulfill their obligation to all payment cards accepted. Merchants will provide compliance validation documentation to their Acquirer(s). Compliance validation documentation consists of the appropriate annual self assessment questionnaire (and accompanying attestation of compliance) and possibly the quarterly PCI scan compliance report.