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Top1. Introduction
The fact that satisfied clients are the key to long term success for businesses is well-documented in the literature (Kristensen et al., 1992; Zeithaml et al., 1996; McColl-Kennedy & Schneider, 2000). Client contentment and faithfulness are one of the sources of competitive advantage, a means of development for a business organization and sometimes, its rescue from crises. If clients have a high level of satisfaction, return on investment (ROI) will increase (Armstrong & Kotler, 2000; Frederick, 1996; Weitz & Jap, 1995). Numerous researchers have confirmed the existence of a positive relation between customer satisfaction and enterprise profitability (Eklof, Hackl, & Westlund, 1999; Garbarino & Mark, 1999; Grossman, 1998; Hallowell, 1996). Profitability measurement plays an important role in quality and productivity improvement activities. Measurement provides the basis for an organization to assess how well it is progressing toward its predetermined objective, helps to identify areas of strengths and weaknesses, and decides on future initiative with the goal of improving organizational performance (Amaratunga & Baldry, 2002). The evaluation and measurement of the client's satisfaction is one method of measuring the organizational function, especially service organizations. Services have been categorized as being either consumer services (e.g. department stores) or professional services (e.g. health care).
Health care services hold a distinct position among others due to their highly hazardous nature and the general lack of expertise on the part of the patients, who are the de facto consumers of the companies providing these services (Taner & Antony, 2006). As it is normally expected that human health be the focus of constant attention for maintenance and improvement, bedridden patients in hospitals depend on receiving the best possible clinical services. The patient's needs, expectations, and experiences of receiving health and clinical services manifest in the complicated phenomenon of satisfaction. Therefore, increasing patient contentment is highly significant to those involved in health-related issues. In this research, we focused on the clients of one of Iran's first and largest private hospitals, located in Tehran, which was established nearly 60 years ago. Studies have shown that organizational performance can be affected by various factors. For example, in 1997, Ch. Orpen examined the effect of obligations and work motivation on organizational performance. In 2003, the effect of self-competence and intentionality on function was examined by Robert P. Steel. Table 1 summarizes the results of research done on the parameters affecting organizational function: among these, motivation is one of the most significant factors and its effect on function has been examined repeatedly by different researchers.