We are currently living in the knowledge era, and the provision of knowledge is a very important source of companies in today's world. It is difficult to compare the knowledge intensity of different occupations because different workers use different types of knowledge, while it also remains difficult to put forward the most accurate definition of this word, as numerous authors use a variety of definitions for the term "knowledge". A description of knowledge-intensive services (KIS) has two components. The first view is from an input perspective, and states that KIS are industries intensively focused on technological inputs that mainly provide services dealing with human capital. The second view sees knowledge intensive services from an output perspective, as knowledge-intensive firms sell knowledge. The reason for the continuous growth in the number of KIS in the world economy, and the reason why K15 are becoming more and more important each year, are two-fold: because there are many challenges involved in contemporary economic activities and that companies are more often using external partners (knowledge-intensive services) to drive innovation than in previous eras. Knowledge services are also an important part of sustainability, e.g., in the tourism industry, where the industry's importance for a given country's economy is undisputed. The significance of this study is to clarify the level of knowledge services in the Czech Republic as a new phenomenon, and its comparison with V4 countries, using key indicators. The first sections of the article contain scientific work, with the introductory part focused on a thorough survey of the current state of the issues and the levels of sustainability, tourism, and services. In the following section, mathematical methods of the multi-criteria, decision-evaluated level of knowledge services in the Czech Republic are presented in comparison to the V4. In conclusion, the different findings are generalized and formulated into conclusions while the application of the knowledge contained in the publication is defined.
