We developed DOTO System about 3 years ago based on our 20 years of experience in software development and consultancy. During our work, we relied on our experience that the system should serve tens of thousands of users at the same time. DOTO System supports the users in performing completely different operations, for which different competencies are necessary. Usually, DOTO System users are employees of many organizations, which may not be related to each other hierarchically. These organizations work together to fulfill their common duties, for which DOTO System provides the integration.