Nowadays, people are turning to the internet to search for information and are completing their work using web systems or mobile applications as their medium. This study was conducted to determine the relationship between web systems and end-user effectiveness and performance. This study collected information using primary data, with a population of 200 students from University Sultan Zainal Abidin (UniSZA) in the Faculty of Informatics and Computing. According to Krejcie and Morgan's 1970 table, the sample size is 132. By using SPSS software, the Pearson Correlation formula tests the input. Based on the testing data, the effectiveness of the user using a web based system is 0.633, whereas the effectiveness of using a mobile application is 0.973. In conclusion, there is a moderate relationship between using web systems and the effectiveness of the end-user. Furthermore, there is a strong relationship between using mobile applications and the effectiveness of the end-user. This study recommends that future researchers and the developers of web systems or mobile applications should design better and more suitable questionnaires to achieve excellent results. Developers need to be aware of the relationship between web systems and mobile applications and their end-users so that they can improve their systems and applications.
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