7th INTERNATIONAL FORUM ON TOURISM STATISTICS 9-11 June 2004, Stockholm (Sweden) tourismforum@scb.se NEW RESEARCH LINES ON TOURISM INFORMATION SYSTEMS: POTENTIAL DEMAND ANALYSES LUIS VALDÉS1, EMILIO TORRES2, EDUARDO DEL VALLE3 Tourism Information System of Asturias University of Oviedo Abstract: Studies on Potential Demand detect and analyse quantitatively and qualitatively the future tourism trends of the potential source markets, providing both private and public policy makers with valuable information for their decision-making. The methodology of Potential Demand Analysis develops an analysis procedure which collects information on the current demand and services, the socio-economic characteristics of the potential source markets, their holiday habits, the image they have about the destination and the type of product and service which are likely to be demanded. This synthesis allows the design of new products and services, as well as the adaptation of tourist infrastructures to that Potential Demand. The Tourism Information System of Asturias (SITA) has been developing this kind of studies since 2000 and this paper aims at presenting the main scientific and technical features of this methodology, the advantages and disadvantages, the difficulties and the solutions the SITA has experienced. I. INTRODUCTION Traditionally, the main components of a Tourism Information System (TIS) are based on three fundamental pillars: the analysis of current tourism demand, the analysis of current offer and the macroeconomic analysis of tourism activity (WTO, 2002). In the last ten years several experiences, more or less complete, have been carried out and among them the regional system SAETA (Aurioles, 2000) and the Asturian SITA (Valdés, 1997) in Spain. 1 Director Sub-director 3 Coordinator Tourism Information System of Asturias C/ Tomás y Valiente 1, E-33201 Gijón (SPAIN) http://www.sita.org e-mail: sita@correo.uniovi.es 2 However, the growing needs for information to help private and public policymakers in decision-making require new measuring tools which allow a better knowledge of the tourism activity and its implications. We can distinguish four broad research areas the TIS will have to deal with in the near future: Tourism in private accommodation (Laimer, 1999; Javor & Kalcic, 2000 Cortina et al., 2002; Gismondi & Mirto, 2002; Valdés & Torres, 2003). Further deepening in methodologies of tourist expenditure estimation (WTO, 2000; Canadian Tourism Commission et al., 2002; Valdés et al., 2003). Tourism sustainability indicators (OECD, 1993; Dupeyras, 2002; EUROSTAT, 2002; Ministerio del Medio Ambiente, 2003). Potential Demand Analyses. In this sense, the Tourism Information System of Asturias (SITA) has been going into the aforementioned research lines to enhance the recognition of Tourism’s socioeconomic importance and its future role as a major provider of jobs and economic growth, and, in particular, since 1999 it has implemented several statistic operations to know the Potential Demand of the region, given the need of public and private policymakers to carry out short- and long-term policies. Traditionally, the study of the tourist demand has been outlined from the viewpoint of the destination, that is, analysing the habits of the visitors' trip, their preferences, attitudes, behaviours and valuations during their trip in the visited place. Research in destination presents clear advantages of time and cost, allowing to structure and to know the profile and the behaviours of the visitors of a region. However, it is necessary to recognize its descriptive limitation, because although it analyses the behaviour of the consumers of products and tourism services of the current visitor, it does not detect the potential. This descriptive approach obviates new segments of visitors involving a weakness in tourism commercialisation plans as they repeatedly influence in the same markets and tourism typologies. The Demand Analyses regarding Potential Destination (PDA) should be framed in this context. Said analyses solve these lacks and substantially improve knowledge of the tourism demand. Basically they consist in research on the characteristics of the trips of 2 the residents in a city and the fundamental aims are determining and segmenting the potential of that concrete geographical market, taking as reference the perceptions on a concrete destination, generically denominated Potential Destination. The Tourism Information System of Asturias has defined and analysed four large blocks of potential source markets of visitors to Asturias applying the PDAs regarding Asturias, a region located in the north of Spain, as a Potential Destination: the Atlantic market (Valdés, 2002c), the Castilian market (Valdés, 2002d, 2002d), the Cantabrian market (Valdés, 2002a, 2002e) and the Levantine (Valdés, 2003) (Figure 1). In this type of Analyses, there are two main problems to solve. The first difficulty is the determination of well defined geographical areas. These must be previously valued and evaluated by means of an exploratory analysis which foresees interest in them with a view to obtaining valid PDAs. This should enable the carrying out of an appropriate tourism promotion plan in these markets and adaptation of the offer in the Potential Destination. The second inconvenience of this type of studies is that it is not based on current behaviours, as it is the case of surveys in destination, but on past experiences and on future perceptions, and therefore they should be treated with the right amount of consideration and caution, especially when it is sought to quantify potentials markets. Figure 1: Potential markets for Asturias. Castilian market La Coruña Vigo Bilbao León Oporto Atlantic market San Sebastián Cantabrian market Palencia Burgos Valladolid Valencia Levantine market 3 In this work the main methodological characteristics of the PDAs developed by the Tourism Information System of Asturias are presented. The approach of this research line has meant the methodological design of PDAs paying special attention to the principles and guidelines characteristic of scientific research. This research is developed in five phases: establishment and definition of the objectives of the research, determination of the geographical environment of interest, survey design, analysis of the information and dissemination of results. Below, the most relevant characteristics in the different phases of this research line are detailed. II. OBJECTIVES OF THE POTENTIAL DEMAND ANALYSIS The PDAs carried out by SITA have five fundamental objectives: i) Determination of the geographical environment of interest; ii) Analysis of the holiday habits of the residents; iii) Study of their holiday habits with regard to the destination; iv) Evaluation of their choice dynamics of tourist destinations; v) Forecasting the frequency and characteristics of trips in source with regard to the Potential Destination. The methodology proposed for the attainment of these objectives is based on a socio-economic analysis of the resident population of the geographical environment considered of interest, on the study of the current behaviour of the visitors to this region in the destination and in the design of a survey in the place of residence. 4 III. DETERMINATION OF THE GEOGRAPHICAL ENVIRONMENT OF INTEREST The first phase to carry out a PDA regarding a Potential Destination consists of the identification, as a market of interest, of points or geographical areas where the second phase, consisting of a survey of the resident population, will be developed. Like this, the determination of such geographical environments is carried out based on four fundamental principles: 1. The geographical principle of vicinity, in time and / or distance is the first essential element when thinking about the capturing of new tourism markets, more so if one of the objectives of the tourism plan of the Potential Destination is to obtain a deseasonalization of the tourist activity. Analysis of the main communication routes, usually overland and air, the frequency of public transport services, as well as the characteristics of the journey are essential elements to determine the geographical areas of interest. In the case of public and private transport, both overland – car, bus and train – and air, Aza and Valdés (2003) have developed a specific methodology which analyses the flows of travellers with Asturias as destination or source. 2. A second approach to establish the geographical environment of interest is based on secondary statistical sources elaborated by Statistical Institutes, Local Observatories, Chambers of Commerce, etc. and which present the main socio-demographic characteristics of the resident population of the region: number of inhabitants, income per head, employment rate, distribution of age / population, etc.. 3. The third research axis quantifies the current importance of this source market regarding the Potential Destination (Valdés et al., 2001). 4. Lastly, the fourth variable of analysis in this first phase consists of analysing the services and products which the tourists of the source market consume in the Potential Destination, by means of a survey in destination which determines the main characteristics of the current demand (Torres et al., 2002). 5 Independently of these objective considerations, certain analysis in other geographical environments can also be carried out in function of institutional needs and of the tourism policies of the different governments or organisms in charge of tourism promotion. IV. METHODOLOGY OF THE SURVEY Once the geographical environment of the PDA is specified regarding a Potential Destination, the following phase consists of the design of a survey in said environment which contributes information on the resident’s holiday habits and the dynamics of their election of the tourist destination. Like this, and following the proposed objectives (knowledge of holiday habits, of choice of destinations and of perceptions, attitudes and experiences), it is established that the object population of this survey are the residents over 18 years of age who travel for holiday or leisure reasons. The absence of the sample frame means the design of a combined sampling of quotas plan, in function of age, sex and neighbourhood residence, and of random routes. To obtain data without seasonal bias, usually the duration of the fieldwork is limited habitually to ten consecutive days in low tourist season with a maximum sampling error of 5% at the confidence level of 95%. The amount of information required for the analysis of potentiality implies that the best procedure to obtain it is by means of a personal interview structured by means of a questionnaire. This is made up of a total of 28 questions and it identifies the object population's main tourism habits as for the planning of holiday trips, their perspectives and perceptions on the Potential Destination The obtained information is structured in six areas of knowledge or of interest: the population's holiday habits, dynamics of choice of destination, knowledge of the Potential Destination, configuration of a trip to the Potential Destination, comparative analysis between regions and classification variables. This information allows, among other things, to identify potential visitors, to generate new products or to adapt the offer to the potential demand and to configure certain specific actions of tourism promotion. 6 Breaking down the different informative blocks, according to the variables which they are composed of, the following areas of knowledge are obtained (Figure 2): a) Geographical environment. Are all those variables referring to the geographical localization of the interviewee: city, neighbourhood, autonomous community. b) Holiday habits. Are the group of variables which reveal the fundamental characteristics which conform the tourist trips that the residents habitually carry out like for example the duration and frequency of their trips, the destinations of the trips, the type of accommodation used and the activities which they carry out during their free time. c) Choice dynamics of a destination. Are the variables which describe the process that leads to the selection of one place or another as a tourist destination. These consist of choice reasons, in the design of the trip, in the aspects of the accommodation, in the search for information and in the reasons for renting the accommodation. d) Journey to the Potential Destination. Is a block of variables which tries to identify the degree of knowledge of the Potential Destination based on the realization of previous trips to the Potential Destination. The main purpose for the trip, the availability of some private accommodation in the Potential Destination and the season or frequency of the trip are analysed. e) Configuration of the trip to the Potential Destination. Are those variables which describe a hypothetical trip to the Potential Destination like the possibility or wish of the interviewee to choose it, the organization of the trip, the search for information, the configuration of the trip and the price which they would be willing to pay for it in function of a series of parameters like accommodation type, type of board and the inclusion of excursions and transfers to the Potential Destination. f) Perceptions on the Potential Destination. Is the group of variables which shows the degree of knowledge, the ideas or the interior feelings which result from previous visits to the Potential Destination and other bordering regions, 7 or from the image they have in the event of not having visited. This highlights the weaknesses and strengths of the Potential Destination as opposed to other competitor regions. Figure 2: Variables of the questionnaire. AREAS OF KNOWLEDGE GEOGRAPHICAL ENVIRONMENT HOLIDAY HABITS CHOICE DYNAMICS OF DESTINATION PREVIOUS VISITS TO THE POTENTIAL DESTINATION CONFIGURATION OF THE TRIP TO THE POTENTIAL DESTINATION PERCEPTIONS OF THE POTENTIAL DESTINATION VARIABLES CONTROL VARIABLES City Realization area Autonomous community Duration of the trip Destination Accommodation type Frequency of the trips Activities Sport activities contracted Reasons for choice of the destination Design of the trip Aspects of the accommodation Search for information Reasons for renting the accommodation Reason for the trip Private accommodation in the Potential Destination Possibility of choosing Potential Destination Organization of the trip to Potential Destination Search for information Configuration of the trip to Potential Destination Concepts / ideas on Potential Destination Visited bordering regions Weaknesses of Potential Destination as opposed to other communities Strengths of Potential Destination as opposed to other regions Sex Age Profession V. DESCRIPTIVE RESULTS The results of the research are structured in a descriptive analysis and in action recommendations. This methodology allows us to describe the general configuration of the habits of the travellers from the source market, how the configuration of a trip to the Potential Destination would be and the perceptions which they have of the Potential Destination (Figure 3). 8 Figure 3: Outline of descriptive results for the potential destination. Type of trip in function of its duration a) G GENERAL Short trips Long weekends / Bank holidays Medium length trips Long stay trips e CONFIGURATION OF THE TRIP n e r Destinations Nearby regions Other destinations Type of accommodation Type of accommodation according to destination Frequency of trip according to destination Choice reasons of a destination Configuration of the trip Activities Sport activities contracted Importance of aspects of accommodation Search for information Reasons for contracting one type of accommodation or another a l c CONFIGURATION OF THE TRIP TO o POTENTIAL DESTINATION (PD) n Main purpose for trip Private accommodation in PD Possibility to choose accommodation in PD Theoretic planning of the trip to PD Global City hotels Rural accommodation f i PERCEPTIONS ON g THE POTENTIAL DESTINATION (PD) u Organization of the trip to PD Search for information Estimated price of trip Accommodation in the PD Type of board Excursions and transfers Concepts / ideas on PD Bordering regions visited Weaknesses of PD as opposed to other regions Strengths of PD as opposed to other regions ration of the trip. In this block of results a description of the habits followed by the residents during their trips in function of their duration is carried out, of the most frequent destinations, the type of accommodation chosen. Other aspects analysed are reasons for choice of destination, the configuration of the trip, activities carried out, sport activities contracted, the importance of aspects of the accommodation, the search for information and the reasons for renting one accommodation or another. In short, the following characteristics are detailed: 9 a.1) Type of trip in function of its duration. The distribution of frequencies of the most habitual configuration of trips is obtained according to their duration (short trips, long weekends and bank holidays, medium length and long trips). As each type of trip presents characteristics which are very different from those of specific tourist behaviours it is necessary to analyse them separately according to the nearness of the destination, the type of accommodation used and the frequency of the trip. Destinations. Are the most frequent destinations in general terms, and are classified into four groups: in the same province, in the autonomous community, in near autonomous communities and in other destinations. Analysing the obtained results, the place which represents the Potential Destination can be valued within the group of destinations. Usually in short trips the most frequent destinations are near to the place of residence of the interviewee, while for trips of a longer duration, destinations which are further away are preferred, that is to say, the duration of the trip and the distance to the destination hold an inverse relationship. Accommodation type. According to the duration of the trip, the type of accommodation used is obtained (hotel, rural tourism, camp site, second home, houses of family and friends) (Figure 4). Figure 4: Type of accommodation. 10 Accommodation type according to destination An analysis of the type of accommodation chosen according to the destination is carried out, and like this the variation of accommodation type is detected according to the distance to the destination. Frequency of trip according to destination. The relevance of a market not only resides in its size but also in its mobility. For this, the frequency with which trips are carried out in function of the elected destination is fundamental. a.2) Choice reasons of a destination. The reasons which lead tourists to choose one destination or another are analysed, falling upon the most influential, such as climate, recommendations, heritage both natural and cultural, price, etc. The mentioned reasons are checked to see if they fit in with the configuration of the current offer of the Potential Destination and if not, opportune measures are suggested to adapt that offer to the potentialities of the demand. a.3) Configuration of the trip. Valuation of importance. In the design of a trip it is important to know which are the most significant aspects that are considered in its elaboration and planning, paying attention to the valued elements, such as accessing information and the contracting of the trip through travel Agencies, the interest for weekend offers, the acceptance of vouchers or discount checks in the accommodation or having tourism packages. a.4) Activities. For an integral design of the trip it is convenient to know the activities which the tourists carry out during their holidays. a.5) Sport activities contracted. In the case of tourists interested in doing sport activities it is necessary to know which they would be willing to contract with the purpose of adapting the offer to the necessities of the demand. a.6) Importance of aspects of the accommodation. This is the valuation which is attributed to certain accommodation aspects and it identifies which attributes are most relevant for the consumer, such as for example price, comfort, setting, services, etc. (figure 5). 11 Figure 5: Importance of aspects of the accommodation. Activities Architecture and design Extra services Valued aspects Setting and environment Price Comfort of facilities Others a.7) Search for information. It is fundamental to know the most used method in the search for information about the chosen destination by the residents, because in function of the obtained results the most convenient advertising media can be suggested, be it press, radio, specialized pamphlets, etc. a.8) Reasons for renting one accommodation or another. One of the most relevant variables to design the commercialisation of an establishment comes from knowing the reasons which motivate tourists to rent one accommodation or another. The coding and analysis of the main reasons are an essential determinant element for later promotion recommendations and adaptation of the tourist offer. b) Configuration of the trip to the Potential Destination. In a second descriptive block, the positioning of the Potential Destination in the originator market is presented according to the perceptions shown by the tourists from the source market. 12 b.1) Main purpose for the trip. In the case of the interviewee having previously carried out trips to the Potential Destination, the purpose for this trip is asked, because in some cases it can be indicative of the motivations for possible future trips to the Potential Destination. b.2) Private accommodation in the Potential Destination. This refers to the possibility which the interviewed citizens have of using non-regulated accommodation, this is, second home or houses of friends and family in the Potential Destination. For those people who have private accommodation, their trips in function of the period of the year in which they use it are characterized, showing whether non-seasonal use exists. b.3) Possibility to travel to the Potential Destination. With this variable, the potentiality of the source market regarding the Potential Destination for carrying out future visits is identified. By means of a scale of three values (no possibility, perhaps, and very probably) an indicator of the potentiality of the Potential Destination is provided which will be related to the perception on the Potential Destination. b.4) Organization of the trip to the Potential Destination. In the event of wishing to go to the Potential Destination on holiday, it is interesting to know what the organization of the trip, as to the use of tourism intermediaries or not, would be (tourism package, travel agencies, acquaintances, on one’s own account, etc.) in order to establish the most appropriate strategies in commercialisation (Figure 6). Figure 6: Organization of the trip to the potential destination. 13 b.5) Search for information to travel to the Potential Destination. This variable identifies the most used means for obtaining information on the Potential Destination and falls upon the advertising media with greater penetration, studying the relationship to the means used for a search for information of an arbitrary destination (Figure 7). Figure 7: Where would information be looked for in the case of wishing to travel to the potential destination? Search for information on destination Tourism offices Travel agencies Books/guides Internet Friends and family Others b.6) Planning of the trip to the Potential Destination. This is the most frequent configuration as for accommodation type, board, activities, transfers and prices which the travellers of the object city of the study are willing to pay for a weekend trip and for a stay of one week for a standard trip. Estimated price of the trip. Minimum, middle and maximum prices are estimated which on average the travellers from the source market are willing to pay for a weekend trip and for a stay of one week. The knowledge of the different levels of prices allows a price policy and services coherent with these preferences to be designed ( Figure 8). 14 Figure 8: Estimated price of the trip. Estimated price of trip Weekend Long stay Mean Mean Standar deviation Standard deviation Accommodation in the Potential Destination. This variable shows which accommodation type the tourists of the source market would prefer for their stay in the Potential Destination. Board. The managerial sector is interested in knowing the type of board (accommodation only, accommodation and breakfast, half board or full board) which these potential tourists would choose for a weekend or vacation stay. Excursions and transfers. The inclusion or not of excursions and transfers during the stay in the Potential Destination can show differences according to its duration, for which a frequency chart with both types of trip can be interesting to compare them. c) Perceptions of the Potential Destination. The third analysis block works with the ideas or concepts of the image of the Potential Destination which the tourists who have previously travelled to the region have as well as those who have not yet done so. Like this it will be verified if the image which the Potential Destination tries to transmit coincides with the one really perceived. 15 c.1) Concepts / ideas on the Potential Destination. The ideas or concepts which make up the image of the Potential Destination are of special interest for the design of promotional campaigns, verifying the real perception of the Potential Destination among the residents of the source market. c.2) Nearby regions visited. An essential element to study possible market competitors consists of determining if the bordering regions to the Potential Destination receive more or less visitors, and like this be able to design a strategy, of either cooperation, or of differentiation, according to the importance of the competitor markets. c.3) Weaknesses of the Potential Destination as opposed to other regions. To identify the weakest factors of competitiveness in the Potential Destination regarding other destinations and to influence them, the highlighted positive perceptions of the different direct competitor regions of the Potential Destination over the Potential Destination is described. c.4) Strengths of the Potential Destination opposed to other regions. On the contrary, to analyse the strengths of the Potential Destination, the most positive aspects of the Potential Destination are described as opposed to the other regions. Like this, the key elements of the region’s competitiveness within the national tourist offer can be shown. VI. CONCLUSIONS The public and private organisms in charge of tourism administration and promotion demand more and more specific and detailed studies, with a special interest in those guided to deseasonalize tourist activity. Potential Demand Analyses are valid instruments to provide the necessary and required information in the decision making of different social agents, both at the level of tourism administration and the managerial sector. They contribute information about the potentiality of tourism growth of a destination for each concrete source market, identifying the tourism habits of the source market, the tourism package which would 16 be demanded in the destination and the perceptions and sensations which the destination transmits to the travelling population of the source market. From the tourism administration, which intervenes in environments of activity planning and of tourism promotion of a destination, the obtained results allow to structure useful and valuable information for the programming of institutional or managerial tourism promotion campaigns, to evaluate the source capacity of potential tourists of that market and to carry out an estimation of the possible growth in the number of visitors from this region to the Potential Destination in the short term. The image of that destination regarding the potential market, allows the structure of more direct and more specific communication policies, highlighting the excellent aspects of the destination. From the managerial environment, this type of market research is a valuable source of information for the configuration of marketing policies in all their aspects, product, price, distribution and communication. They permit an estimation of the optimum duration of the trip to the Potential Destination for the residents of the source market, and in accordance with their preferences, tourism programs with the alternatives and products expected by the visitors are considered, evaluating the profitability of these packages or tourism services. Also, the main attractiveness of the Potential Destination is identified as opposed to other regions and those products or services which are still not well known or valued enough. The experience developed by the Tourism Information System of Asturias has solved the methodological difficulties inherent to this type of studies in a satisfactory way, adding and integrating this research line to the traditional studies of Supply and Demand. 17 REFERENCES AURIOLES, J. (2000) “El proyecto SAETA. Un instrumento para la observación regional del turismo como actividad económica” Estudios Turísticos, nº 144–145, pp. 103–124. Instituto de Estudios Turísticos, Madrid. AZA, R., VALDÉS, L., (Dir.) (2003) Estudio de impacto económico y potencial de captación y generación de tráficos del aeropuerto de Asturias. Ed. Thomson-Civitas, Madrid CANADIAN TOURISM COMISSION, INSTITUTO DE ESTUDIOS TURÍSTICOS, SWEDISH TOURIST AUTHORITY, WORLD TOURISM ORGANIZATION (2002) Research on international experiences in measuring visitor expenditure associated with inbound tourism. Provisional version. Ed. Araldi. Madrid. CORTINA, F., MARTÍNEZ, A., VARELA, B. (2002) “Aproximación a la investigación del alojamiento privado de uso turístico”. Estudios Turísticos, nº 151, pp. 87–97. Instituto de Estudios Turísticos, Madrid. DUPEYRAS, A. (2002) “OECD indicators for integrating environmental concerns into tourism policies”, 6th International Forum on Tourism Statistics, Budapest. EUROSTAT (2002) Community methodology on Tourism statistics. Proposal for updates, rev.1a., Luxembourg. GISMONDI, R., MIRTO, A. (2002) “El turismo en los alojamientos colectivos y privados en Italia: definiciones, clasificaciones y técnicas estimación”. Estudios Turísticos, nº 151, pp. 51–85. Instituto de Estudios Turísticos, Madrid. JAVOR, A., KALČIĆ, I. (2000) “Private accommodation in tourism statistics in the Republic of Croatia”. 5th International Forum on Tourism Statistics, Glasgow. LAIMER, P. (1999) “The existing data collection system for private accommodations on use of tourism supply and tourism supply in Austria”. Task force meeting on methodological issues linked to tourism, Luxembourg. MINISTERIO DEL MEDIO AMBIENTE (2003) Spanish System of Environmental Tourism Indicators. Madrid. OECD (1993) “OECD core set of indicators for environmental performance reviews”. Environment Monographs, nº 83. Organisation for Economic Co-operation and Development, Paris. TORRES, E., SUSTACHA, I., MENÉNDEZ, J.M., VALDÉS, L. (2002) “A solution to problems and disadvantages in statistical operations of surveys of visitors at accommodation establishments and at popular visitor places”. 6th International Forum on Tourism Statistics, Budapest. VALDÉS, L. (Director) (1997) El Turismo en Asturias. Universidad de Oviedo. Dirección General de Comercio y Turismo del Principado de Asturias, Gijón. 18 VALDÉS, L. (Director) (2002a). La demanda turística de la ciudad de Bilbao. Principado de Asturias. Universidad de Oviedo. Gijón. VALDÉS, L. (Director) (2002b). La demanda turística de la ciudad de Burgos. Principado de Asturias. Universidad de Oviedo. Gijón. VALDÉS, L. (Director) (2002c). La demanda turística de la ciudad de Oporto. Principado de Asturias. Universidad de Oviedo. Gijón. VALDÉS, L. (Director) (2002d). La demanda turística de la ciudad de Palencia. Principado de Asturias. Universidad de Oviedo. Gijón. VALDÉS, L. (Director) (2002e). La demanda turística de la ciudad de San Sebastián. Principado de Asturias. Universidad de Oviedo. Gijón. VALDÉS, L. (Director) (2003). La demanda turística de la ciudad de Valencia. Principado de Asturias. Universidad de Oviedo. Gijón. VALDÉS, L. DE LA BALLINA J., AZA R., LOREDO E., TORRES E., ESTÉBANEZ J.M., DOMÍNGUEZ J.S., DEL VALLE E. (2001) “A methodology to measure tourism expenditure and total tourism production at de regional level”, in LENNON J. J. Tourism statistics international perspectives and current issues. Continuum, Gran Bretaña, pp. 317-334. VALDÉS, L., TORRES, E. (2003) “El turismo en alojamientos privados. Líneas de trabajo del Sistema de Información Turística de Destino Potencial”, I Reunión Grupo de Trabajo sobre la estimación del alojamiento privado de uso turístico, Madrid. VALDÉS, L., TORRES, E., DOMINGUEZ, J.S. (2003) “Econometric models for tourism expenditure. Inappropriateness of the classical estimation methods”, 54 Session of the International Statistical Institute, Berlin. WTO (2000) General guidelines for developing the Tourism Satellite Account (TSA). Volume 1. Measuring total tourism demand. Ed. WTO, Madrid. WTO (2002) Apuntes de metodología de la investigación en turismo. WTO, Madrid. 19