A situation in which the observers can assume the conclusion that multiple subjects are acting as a system for a common goal (a complex); but truly, all subjects had zero involvement with each other and it was merely coincidence that they seemed to have a common goal (stand alone).
Police are looking for suspects for 2 murders and a robbery. at the seen of the murders and the robbery a picture with Justin Beiber with a gunshot to the head is found. The police take this as being the signiture of the suspect/s method of operation. At the end of the cases a suspect was found for each case but all of them had no connection to each other and the Justin Beiber picture was dropped by one suspect, another was already at the scene before it had happend, and the other was dropped after the suspect left. The police had just witnessed a stand-alone complex