A method and system for tracing components in computer applications is provided in which trace data from components can be logged in real time. A hierarchical control interface 209 is used in which leaf nodes 306-311 represent components 204 being traced. The hierarchical control interface 209 includes means for setting trace levels for components 204 being traced. A non-hierarchical trace system 210 is used for carrying out the trace processing and includes means 320 for storing trace level settings received from the hierarchical control interface 209. The trace system 210 also includes means 322 for receiving a call from a component 204 with trace data; means for checking the trace level settings 321 for the component 204; and means for storing or discarding the trace data accordingly.