TOPSIS method is used to solve Multiple Criteria Decision-Making problems. It is applied in various fields including engineering, human resources, finance and construction industry. There are two main objectives in this paper. First, an analytical approach of applying TOPSIS in analysing data collected using questionnaire is developed in this paper. Second, the data collected in this study aim at investigating the perception of online assessment among the lecturers in the university. Online assessment is an adoption of technology in the process of teaching and learning. Using online facility to conduct assessment provides many advantages to the lecturers and students especially the flexibility in teaching and learning. With the advancement of technology in this era, online assessment is highly encouraged and endorsed by the university. The analysis using TOPSIS method in this paper successfully produced the ranking of the lecturers based on their acceptance level of using online assessment. This finding can help administration in the university to understand the acceptance level of using online assessment among the lecturers. The ranking of the lecturers may also help the administration to identify who need to attend professional development program in order to increase their usage of online assessment in their courses. The method of applying TOPSIS in analysing data collected using questionnaire is not common in the application of TOPSIS. The approaches and findings presented in this paper can be served as a reference for other researchers who involve in similar data collection method in future.