## 1 Introduction  
The era known as Industry 4.0 brings big changes to all business segments and, therefore, people's lives. Perhaps the biggest impact of this economic revolution will be on the telecommunications segment and thus on telecom operators. Telecom operators will have a key role in the Industry 4.0 era. Their participation in the full capacity and contribution to the development of the quality of people's lives will require that they adapt in accordance with the changes brought about by this period. This adjustment will not be easy, and many will make mistakes, further slowing their own development, as well as Industry 4.0 activity. Therefore, it is necessary to have a comprehensive model that will provide an accurate, fast and high-quality assessment of the potential of telecoms, suggesting guidelines for the development and transformation of telecom operators according to the results. After researching currently known and primarily used models and their applications [1; 2; 3; 4; 5; 6], it was concluded that there is no model for very fast, high-quality telecom operator potential analysis \"from the top to the bottom\". The analyzed models and frameworks are: Enhanced Telecom Operations Map (eTOM) Frameworks, the Shared Information and Data (SID) Model, the Technology Acceptance Model (TAM), the Training Needs Assessment (TNA), Technological-Organizational-Environmental Frameworks (TOE), Information Technology Infrastructure Library Frameworks (ITIL), Different Techno-Economical Models [7], Different Business Analysis, Different Cost Analysis, the SWOT Model, the PESTLE Model, Porter's Five Forces, the Ansoft Matrix, the Boston Consultancy Group Matrix (BCG) and other relevant models. All relevant explanations of these models can be found in Appendix A of this paper. eTOM (Enhanced Telecom Operations Map) Frameworks [8; 9; 10; 11; 12; 13; 14; 15; 16] defines all details and parts of the telecom service provider activities. The set of documents helps in creating business processes \"from end to end\" for telecom operators [17]. Sharing information and data model (SID) defines telecom operator business processes and serves the purpose of the quality development of open and automated OSS/BSS systems [18; 19; 20]. The Technology Acceptance Model (TAM) [21; 22; 23], together with the Technology-Organization-Environment (TOE) model [24], explore factors of building information modelling (BIM), but the TAM model also analyzes the substantial use of Internet technologies for training and learning purposes. The TOE framework model defines three main levels and their influence on how individual organizations accept innovations based on new technologies and their dimensions and characteristics. The TNA model [25; 26; 27] creates and defines rules for Human Resources (HR) issues in any company and represents an excellent base for HR in the CTE Model. The IT Infrastructure Library (ITIL) framework [28; 29; 30] analyzes, among other items in the IT segment, maturity level and smart city readiness. This framework was one of the very good starting points in the development of certain areas (Technological Development Area and Service Development Area) in the CTE model. Business Analysis models [31; 32; 33; 34; 35] analyze different segments in telecom operators; for example, price controls and defining margin rules, competitive strategy, interaction of the OTT business model and the telecom operator, competition and sustainable competitiveness in the business ecosystem, identifying business ecosystems, IT investments in telecom operators and their usability in business processes, and many other purposes.