# Two-Sided Matching Decision Method of Electricity Sales Package Based on Disappointment Theory
## 2 Construction of Evaluation Index System for Electric Power Customers and Power-Selling Companies
### Electric Power Customers' Evaluation Index of Electricity Sales Package
#### 2.1.3 Power Supply Service  
The power supply service mainly consists of the ordinary power supply service and value-added service. The so-called power supply service refers to the service that the power supply company provides customers with some corresponding valuable business activities in the form of labor services to enable customers to purchase electricity and meet their production and living needs. Due to the social, systematic, special, and developmental characteristics of power supply service and the imbalance between power supply capacity and user load, it is slightly different from the general service industry, which generally includes basic services such as meter reading and charging, fault repair, complaint reporting, inquiry, and consultation. The well-known foreign scholars [PERSON], [PERSON], and [PERSON] built the service quality gap module in 1985, believing that service quality is the gap between customer expectations and customer experience, and they proposed 10 dimensions that affect perceived service quality and customer perceived service, namely, responsiveness, accessibility, security, reliability, ability, politeness, communication, credibility, understanding, and tangibility. The authors of [28] elaborated on the relevant contents of power supply service quality and clarified the connection and interrelation between the service of power supply companies and customers' expectations of service quality. In short, if the power supply company can sell electricity according to the four principles of \"high quality, convenience, standardization, and sincerity\", the higher the quality of electricity sold by the power supply company will be, the better the psychological feelings it will bring to customers, and the more attractive the electricity sales package will be. In the context of the opening of the power-selling side, value-added services are diversified, mainly including high-quality power supply information services, high-quality power network trading services, high-quality power supply demand services for users, and high-quality power supply services for high-end users, which can be subdivided into electricity engineering, energy efficiency services (contract energy management, comprehensive energy conservation, contract energy consumption consulting), customer services, high-quality power value-added services, etc. [29]. In the open electricity sales market, electricity sales companies mainly rely on the price of the electricity sales package and its services to improve their competitiveness and attract electricity customers. Among them, value-added services are highly scalable, and power-selling companies can improve customer satisfaction by providing high-quality personalized high-quality value-added services for electricity [30]. To meet the special needs of electric power customers, power-selling companies can provide specific personalized services for power-selling packages. To promote the low-carbon development of the power industry and respond to the national green development requirements, power-selling companies can provide power-selling packages with energy-saving services; To improve the application rate of clean energy, power-selling companies can launch customized electricity selling packages for clean services. In the current era of \"Internet plus\", to promote the networking of power consumption, power sales companies can provide power sales packages containing new networking services, keeping pace with the times. Furthermore, by integrating several value-added models and integrating resources, they can launch the electricity sales package with the highest value-added comprehensive service model, which fully responds to the personalized needs of electric power customers [31]. From the perspective of electric power customers, the power supply services of power companies can be characterized by five grades: very bad, poor, average, better, and excellent.