Electronic Commerce (E-commerce) is the activity of buying or selling of products on online services or over the internet. One of the supporting factors that make E-commerce grows is the way they develop websites that make it easier for consumer to buy or sell their products. Since the quality of e-commerce websites can affect the number of customers who decide to shop through an e-commerce system, The Author decided to make a comparison between three well-known E-commerce website such as Tokopedia, Bukalapak, Lazada through WebQual 4.0. In this research, the author uses an manually survey method to 150 respondents who use the three well known E-commerce websites above. The data obtained from the survey were analyzed using descriptive methods, quantitative methods, validity test, reliability test, and multiple linear regression tests. and the results are presented in a table format. The result of the survey to 150 respondents showed three significant influences between variables such as (1) In use satisfaction, (2) Information on quality satisfaction, and (3) Quality of Service Interaction, the results of the analysis were based on both partial or simultaneous website quality.

PT. Mayer Indah Indonesia is a company engaged in the field of textile. In order to face business competition, there are several problems that often arise, namely not having supplier selection procedures. The supplier selection conducted by the company's purchasing department at this time is a direct survey and price comparison. supplier distance with the company so that shipping costs are high and ease of negotiation and payment systems. So the supplier selection needs to be done by using the right method in accordance with company standards, namely weighted product (wp) with the aim of providing information to companies about alternative methods that can be used in objectively selecting suppliers and providing input on the performance of suppliers. Keywords: Selection, Chemical Supplier, Best, Weighted Product.

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