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This study is aimed to obtain measurement reliability among vocational learners assessors in industrial practice activities. The study was conducted in Indomobil Nissan Datsun workshop. There were 32 participants from various vocational schools in East Java, both public and private. Assessors consists of two people, namely the mechanic chief (foreman). The performance attributes assessed are 10,000 km periodic maintenance which includes safety first, preparation for service, and periodical maintenance service. Periodical maintenance services include (1) interior inspection, (2) exterior inspection, (3) engine room inspection, (4) suspension and wheel inspection, (5) inspection of the vehicles underside, and (6) final inspection. The results showed that the inter-assessors reliability was equal, rxy = 0,99. It means that the attribute scores obtained from the two assessors have the relatively similar position to the observed attributes.