GPSS WORLD EXTENDED EDITOR’S OPPORTUNITIES TO SIMULATE HOTEL REVENUE MANAGEMENT SYSTEMS S. Vasileva School of Computer Science, Varna University of Management, Varna 9000, Oborishte str., 13A, tel. +359878491157, e-mail: svetlana.boyadzhieva@vumk.eu Abstract: The main purpose of this work is to develop parametric imitation models of hotel revenue management systems. The realized models can be used to train managers in the hotel business. The development of such training models must follow those stages: Define and classify numerical indicators involved in the measurement of financial condition of a hotel; Draw conceptual model of Hotel Revenue Management System for the purpose of simulations by means of the environment GPSS World and determinate the input parameters and expressions in which they participate; Model modules forming the revenue of the hotel; Compilate algorithms, modeling work management system revenues hotel. A basic simulating working algorithm of the booking module of the hotel revenue management system is proposed. Key words: Booking module, Hotel Revenue Management System, GPSS World, Extended Editor, training INTRODUCTION One of the main skills needed to develop all the future managers (first place in the economy and all its branches) during training it is systemic thinking synonymous with the term "management" [4]. The characteristics of systemic thinking are: context-conditioned; unemotional; operable [4]. To train future hotel managers thinking systematically is the purpose of developing models of Hotel Revenue Management System (RMS) for training students in subject Hotel Management (for specialities: Marketing and Management of the Tourist Services, International Hospitality and Tourism Management, etc.). We propose only a basic model for this kind of system. The main task of optimization in enterprises of hospitality is to allocate available resources in the hotel, i.e. the quantity of rooms, the capacity of the hotel between price classes in order to maximize the total expected income from sales. This process is influenced by many other external factors beside the available resources of the hotel, such as the nationality of the tourists' number (single family / group), type of trip (business / vacation / etc.) and others, as described in [8] and [10]. To begin to the next presented training models modeling algorithms are only modules for booking rooms at a hotel. To prepare future professionals in marketing and management to use automated information systems, the meaning of their use must be understood first, as a mean of helping strategic thinking (part of their work). Training of specialists in the management of various fields of human activity, mainly on the economy, requires using different types of simulation games and simulation training. Several years in many universities are applied this kind of systems, which are an integral part of training. Many companies are engaged in developing models of complex systems for educational purposes, but aside the financial issue, these models and systems are not suitable for teachers in terms of mobility. The most appropriate option would be a teacher, which not only is a specialist in his/her field, but seeks too to help students in their future realization and knows how to help them participate actively (even guided) in developing the necessary training models. There for we would like to show some new features of the system to imitative modeling GPSS World [6] and its extension Extended Editor [1], [5]. GPSS WORLD AND GPSS EXTENDED EDITOR GPSS World's opportunities realizing models for training. GPSS World provides users with software tools to interact with the system in the process of research and simulation software tools, which are realizing immediately the process of modelling. The system and its many applications in training are described in [2], [4], [6] and [9]. In the now "classic" system of simulation modelling (SM) due to the lack of integrated tools that fully satisfy the investigator dealing with SM, the requirements are increased to the level of his/her competence. The Extended editor [1], [5] of GPSS World provides the means and ways to reduce the qualifying requirements to the expert SM, and to the final-user, who uses the created models. In the GPSS Extended editor [5] are automated the majority operations and actions in the conduct of the cycle simulation research. In our experience of working in the GPSS World environment and Relationship with the Extended editor and the Universal editor of forms [3], the imitation modeling can be used as a tool for education, not only in engineering disciplines such as Computer Architecture, Operating systems [9], Database systems, parallel programming, Grid systems [2] and others, where topics are related to synchronization in parallel processes (transactions), but also in training managers of the various sectors of the economy. Extended Editor of GPSS World’s opportunities used in training. The Extended editor is created specifically for researchers who are not experts in SM, but who need to conduct imitation studies [1]. The main training opportunities of the EбtОnНОН ОНТtor’s Text editor [5] are: · The names of the units and commands, reserved words of the embedded programming language PLUS, comments and identifiers are displayed in different colours for better clarity of the text in the model; · Commands and units, arguments and comments are aligned [5]; · In the editor is built recognition system