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Certification FAQ

  • What is RESO certification?

    RESO certification is the process of testing technology systems to ensure that they conform to the capabilities required in ratified standards. Organizations that pass the testing process and accept the terms and conditions of certification receive RESO certification endorsements, and their resulting reports are published at

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  • Who can achieve RESO certification?

    MLSs, brokers and technology organizations of all kinds can achieve RESO certification.

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  • What are the benefits of RESO certification?

    Benefits include fewer errors, lower maintenance costs, faster innovation, efficient data sharing and staying current with industry standards.

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  • What types of RESO certifications are available?

    Certifications include Data Dictionary, Web API, RESO Common Format, Add/Edit, Entity Event and more.

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  • What is the significance of being RESO certified for MLSs?

    MLSs are critical data providers with a wide range of data consumer customers. Being certified on a standard allows simplification and efficiency for all parties accessing MLS data, increasing the data’s utilization and value.

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  • What happens if my organization is not certified?

    Certification is voluntary. Becoming certified demonstrates that your data is optimized to empower your organization to integrate new tools and join data collaborations. It sends a strong signal to potential partners and customers that your company is at the forefront of the industry’s best technology practices. The goal of certification is to bring the technology experience to real estate that consumers and professionals expect.

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  • My MLS vendor is certified. Doesn’t that mean that I’m certified?

    Although a vendor may manage several MLSs, each MLS system is unique and must have its own data set and API capabilities certified. RESO uses MLS access credentials supplied by MLS vendors to verify standards conformance. When an MLS system passes testing, the vendor will reach out to a designated MLS staff representative to ask for results confirmation and an acceptance of certification terms. Once that is completed, certification from RESO is granted.

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  • Which MLSs are not RESO certified?

    RESO publishes lists of known MLSs, including those that are certified and uncertified. This list should not be relied upon to include every MLS that exists.

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  • How can an organization get started with the certification process?

    Technology providers can contact to start the certification process.

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  • What documentation is required for certification?

    Applicants must provide access credentials and undergo technical testing to verify standards conformance.

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  • What does the certification process involve?

    The process includes compliance testing, confirmation of results and acceptance of certification terms.

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  • What happens if a system fails certification?

    Systems can be retested at no additional cost after addressing the issues identified during the certification process.

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  • Is there support available during the certification process?

    RESO staff provides complimentary technical support and resources to RESO members throughout the certification process. Nonmembers can inquire about technical support opportunities.

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  • How long does it take to get certified?

    The certification process only takes a matter of days for each round of testing, but total certification times vary based on the applicant’s ability to supply access credentials to its data set and the amount of corrective work the applicant requires to become compliant with the standard.

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  • How does an organization remain certified?

    Certification is maintained through ongoing compliance with RESO standards and participation in workgroups and discussions.

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  • Can certification be revoked?

    If a system no longer meets RESO standards, certification can be revoked until compliance is restored. RESO reserves the right to retest systems at any time if current compliance is in question.

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  • What does it cost to become RESO certified?

    Certification is complimentary for RESO members. Nonmembers can consult the RESO fee schedule.

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  • Are there any discounts available for certification fees?

    RESO members receive complimentary certification. There are no current discounts for nonmembers.

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  • How long do RESO certifications last, and do they expire?

    A certification endorsement on the newest version of a standard is classified as “Certified Current” on the RESO Certification Map and as “Certified” in RESO Analytics. When a new version is ratified, those current certifications become Certified Legacy. After another new version is ratified, the Certified Legacy endorsements expire and become uncertified. Another label is “Passed,” which means that an MLS provider has done the necessary work to achieve certification but the MLS itself has yet to approve the results. This label can be seen on the RESO Certification Map but not in RESO Analytics.

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