The aims of the project are to study the global technical requirements and to summarize all of the trelechvanicalt requirements for padlocks. In the project, we would use a decision tree and a program to show the summary. Thus, the factories, the companies which sell padlocks, and the users can search all of the technical requirements for padlocks at once. Also, the production costs of investigating the users’ requirements and time spent on searching the global technical requirements can be reduced by using the decision tree and the program.