ENGlobalisation, constantly increasing amounts of information, rapid change of society, segmentation - these are the challenges which boost the importance of social and cultural role of professional qualification considerably. The society is able to react to these challenges only when the education system is modem, flexible and open to constant change and new ideas. Thus it is very important to assess the quality of professional education properly. To determine the quality of professional education various fields of activity or objects can be assessed: offered courses (subjects), study programmes, research and etc. When organising assessment of professional learning, experts play a very important role. In order to guarantee the quality of expert work, the procedures for assessment of professional education institutions must be described and the contents of the results of work performed by an expert group (final conclusions) outlined in detail. Based on the analysis of existing international assessment guides for centres and candidates, guides for learning and development qualifications, regulations of external qualifications, guides to becoming an approved centre and own experience Assessment Methodology of Institutions Evaluating Competency was developed. Assessment Methodology of Institutions Evaluating Competency was developed according contract with Lithuanian labour market training authority.