Ireland has developed a multi-functional M&V system based on an IT-application. Bottom-up approaches are utilised, while specific verification procedures have been established. The quality of verification is provided by defining issues, which are crucial for verification quality, and by combining important factors in order to ensure verification. Among them there is clear scope of actions to be undertaken by the Sustainable Energy Authority of Ireland (SEAI), responsibilities of report submitters, role of a high quality IT-tool in validation of projects, and others relative issues.