Group 1 - The article discusses two essential certificates for skilled personnel: the Vocational Qualification Certificate and the Occupational Skill Level Certificate [2][3] - The Vocational Qualification Certificate is obtained through vocational skill appraisal organized by relevant departments listed in the National Vocational Qualification Directory [2] - The Occupational Skill Level Certificate targets professions outside the National Vocational Qualification Directory that require high technical skills, such as Chinese pastry chefs and passenger vehicle drivers [3] Group 2 - For lost Vocational Qualification Certificates, if the profession is listed in the National Vocational Qualification Directory, the original issuing authority is responsible for reissuing the certificate [5][6] - If the profession is not in the directory, the original issuing authority will provide a written statement with the original certificate's information instead of reissuing [6] - For lost Occupational Skill Level Certificates, individuals can apply for reissuance directly from the social training evaluation organization or the employing unit that issued the certificate [8]