Visualization skills are important for students studying technical communication graphics, engineering drawing and computer-aided design and multimedia. Nevertheless, the level of visualization skills in the subject of Technical Communication Graphics is still at a moderate level. This study aims to see the level of visualization skills in technical communication graphics subjects at the secondary school level in Malaysia. This study also explores the topic of visualization skills that are difficult to master and looks at the importance of visualization skills to master the topic. The methodology of this study uses a quantitative and survey-based approach. The instrument used is a set of questionnaires. The data collected from the form questionnaire was analyzed using SPSS 27.0 software and the results were described using descriptive statistical methods. Cronbach's Alpha reliability value for the entire questionnaire item is 0.795. Based on the analysis of survey data among 107 respondents, it was found that the average value of the mastery of visualization skills for TCG subjects was at a moderate level (M = 3.32, SD = 0.65), showing that there is still a lot of room for improvement in this aspect. A low level of agreement was found in the descriptive examination of the teacher's perception of the level of producing auxiliary view blocks (M = 2.50, SD = 0.71) and producing development drawings (M = 2.56, SD = 0.74). A high level of agreement was found in the descriptive examination of the perception teachers about the importance of visualization skills to master the topics of auxiliary view and development drawing (M = 4.51, SD = 0.56). Overall, the findings show that the topic of auxiliary views and development drawings is a difficult topic to master. Therefore, visualization skills are very important to master topics that are difficult to master in TCG subjects.