QSI BELGELENDİRME MUAYENE VE TEST HİZMETLERİ LTD. ŞTİ., known as QSI, is a Turkish company founded in 2006 in Istanbul. It specializes in UKAS Accredited Certification Services and has established itself as a leading verification body in Turkey and Europe. QSI is accredited by the Turkish Accreditation Organization (TÜRKAK) for various ISO standards, including ISO 9001, ISO 14001, and ISO 27001. The company offers a range of services, including certification for quality and environmental management systems, greenhouse gas verification, and training programs. QSI is recognized for its role in the ICAO CORSIA program and has achieved significant milestones, such as being the first verifier body in Turkey for greenhouse gas verification. With its corporate headquarters in Ankara, QSI serves a diverse client base across multiple sectors, including airports, and is noted for its extensive verification capabilities.