Teamleader

Hi everyone. I need to write one work based on "Test and Diagnosis in Electronics". The subject ,i'm free to choose,but it must be connected to the "Test...." . I can't find any suitable information for it. Only found info about digital electronics testing , but i need somethink about analogue electronics. Is anyone knowns some online resourses dedicated to this topic?Theory? any information regarding this!!!?? i would be greatfull THX.