This research examines the relationship between consumer attitudes and decisions. By examining the attitude forming variables, among others, usefulness, ease of use and risk which directly influence attitudes and the direct influence of consumer attitudes on consumer decisions. The population in this study is a large number of consumers and the amount is not known with certainty, the researchers, for the sample using a random sampling method which is part of the non-probability sampling technique with the criteria of respondents who have shopped in offline retail and online retail, over 17 years old and domiciled in Jakarta. Samples taken amounted to 160 with 32 questions for each respondent. The results show that usefulness and ease of use affect consumer attitudes. While ease of use is the most powerful variable and has the biggest contribution that influences attitude. In this research hypothesis there is one hypothesis that is rejected, namely the effect of risk on attitude attitudes, the results of the study found that risk has no effect on attitude.

The research conducted by this researcher intends to analyze the effect of trust and ease of use on purchase decisions and repurchase intention. The data collection method in this study uses a questionnaire with 130 consumers who have purchased at an online store. The analytical method used is descriptive analysis, and the test instrument uses SEM AMOS. in this study using four variables, thirteen dimensions and twenty-six indicators. The results show that trust and ease of use have a significant effect on buying decisions and also have a significant effect on repurchase intention, and purchase decisions have a significant and significant effect on repurchase intention. so it can be said that trust and ease of use are the entry points that make consumers start to move to the next stage, therefore online store marketers need to pay attention.