the ASSEMBLY_PROCESS need its own identifier PROCESSID. the assembly workers who are working in the assembly process need to report the progress. if the completion is delayed, they need to report the reason for the delay, therefore, the entity ASSEMBY_PROCESS should include the attribute PROCESSID, STARTIME, ENDTIME, PROGRESS, and DELAY. we also need to include the ID number of the computer system that is assembled in this assembly process. the description of ASSEMBLY_PROCESS