SUMMARY
Modem is a device that has the ability to connect cellphones, PCs or laptops to the internet network. The type of modem that is popular today is MiFi or Wi-Fi Modem, which is a portable modem that makes it easier for users to carry the device anywhere. Currently, there are many Wi-Fi modems circulating in the market with various brands and brands that have different specifications and capabilities. For this reason, people must be observant in choosing the right Wi-Fi Modem for their needs. The selection of the right Wi-Fi Modem will maximize the performance of the internet network so as to facilitate activities in internet use. The purpose of this research is to be able to develop a decision support system by implementing the Multiple Attribute Decision Making (MADM) approach using the TOPSIS method for the selection of a Wi-Fi Modem, in order to facilitate the selection of the best Wi-Fi Modem and according to user needs. Based on black-box testing, it shows that the system built can run well. In addition, the calculation results of the TOPSIS method generated by the system with manual calculations produce the same value.