Based on interviews conducted with Building Management and Security at the Jakarta Global University, there are frequent cases of loss of goods. Website for searching lost items created to meet the need for information dissemination that can help the campus community in real time and reliably. This website design uses the Agile Methodology for system development. Beginning with identifying the problems, analyzing needs, system design, implementation, and testing. The results of black box testing with functional testing parameters of the software show that the software can function properly. The Cosine Similarity method is applied in search engines to determine similarity and accuracy values, with the parameters used are the number of the same words in the two text documents being compared, the results of which are visualized in vector form. Questionnaires were distributed to 90 respondents using the System Usability Scale (SUS) method and Likert scale calculations which were processed using the SPSS application. With the parameters of functional success and ease of use, the grade scale obtained is 78.26%, where the average standard SUS Score is 68%, which indicates that the website created has been acceptable or feasible for users. The results of the validity test show that all items are valid, with a significance value of <0.05 and reliable with a Cronbach's Alpha value of 0.856 which is greater than 0.70 which is the minimum value of the recognized reliability value.
Keywords: Lost, Found, Website, Cosine Similarity, Agile Methodology