This study aims to evaluate and provide recommendations by testing the usability level of the Odoo Operation & Maintenance ERP Module application. Using the SUS Questionnaire method, the results of usability testing were analyzed into each parameter of the SUS Questionnaire. The SUS questionnaire has an assessment criteria of “Unacceptable category” with a value range of 0–50 class F and has an adjective rating of “Worst Imaginable to Poor”, the category “Low Marginal” with a score range of 51-62.5 class F and has a word rating OK trait, Marginal High Category with a range of 62.6–70 grade D and adjective rating OK, and Acceptable Category with a score range of 70–100 grade C to A and adjective rating good, very good to best. The test results get a value of 53.25 including the OK Marginal Low category, meaning that it needs improvement so that the system can be well received by users. Further interviews were also conducted with ten informants to obtain a specific description of the complaints of system users. From the results of the interview, an analysis was carried out to provide evaluations and recommendations for improvement of the Odoo ERP Operation & Maintenance Module.