This research has been conducted with the aim of investigating the impact of customer relationship management on customer satisfaction and competitive advantage in two service companies. Therefore, the variables of customer relationship management, customer satisfaction and competitive advantage have been defined according to the research topic. This is an applied research regarding objective and it is descriptive-correlation in term of nature and method. It includes 95 people as statistical population and 76 people as statistical sample. At first, research's reliability and validity have been studied. Research's hypotheses have been tested using structural equation modeling techniques with partial least squares approach. The obtained results indicate confirmation of all the hypotheses.

No abstract

Among the critical industry problems, one is the supply chain. Among the points, reflecting this importance is the coordination of chain orders. Ordering and supplying any event through optimization models has the potential to become competitive advantage. The point that we never face lack or shortage of inventory plays a key role in different areas. Thus, the optimal model can be operational taking into account all the objectives. The purpose of this paper is to provide a model for coordination of supply chain orders using linear programming. The data was evaluated according to expert opinion and in the form of mathematical equation and Gams software. The results showed that the coordination of contractor and supplier orders is largely in the sensitivity analysis group on the values of the objective functions. Moreover, the proposed model also showed that the optimization of order management and unit earnings profit based on it has functional and developmental capabilities. Keyword: order coordination, supply chain, linear planning. 1. Introduction Nowadays, performance of supply chain of an organization compared to rivals is a vital competitive tool in different industries (Sadeghian et al., 2010). Given the globalization and the rapidly changing nature of business, the supply chain has become a tool for organizations that want to compete effectively both locally or globally. Overall, decision-making in the supply chain is done in centralized and decentralized ways. In a centralized supply chain, a single decision maker or the main member, with has access to enough supply information in the supply chain and has the power to make decisions, acts on policy-making for the whole members of the chain (Talaeizadeh et al., 2013). Competitive advantage of an organization largely depends on the supply chain of that organization (HeydariGharabolaq et al., 2009). One of the key concepts of the past few decades is the supplychain management philosophy. The most important cause for focus on this is the ever-increasing increase in competitiveness and efforts to survive in organizations. In recent decades, this has led to the management of procurement, production, and distribution processes to take steps towards the organization's competitive objective (Awasthi et al., 2009). In a supply chain, raw materials are supplied by suppliers, and then they are supplied to retailers or end users. Supply chain consists of all sectors directly or indirectly involved in completing customer orders (Chapr&meindl, 2000). Moreover, the more competitive a market gets, the more important the management of the orders for the customer becomes (PahlavaniQomi and Amiri, 2016). One of the important functions that supply chain manufacturing companies are always concerned with and the decisions related to it have a significant contribution to their competitiveness is supply chain management (Jafarnejad et al., 2015). Today, intense global competition has led to increased customization and faster response to customers. Growing attention to supply chai...