Multi-level Analysis and Information Extraction Considerations for Validating 4D Models of Human Function. - Kostas Marias; Dimitra D. Dionysiou; Georgios S. Stamatakos; Fotini Zacharopoulou; Eleni Ch. Georgiadi; Thanasis Margaritis; Thomas G. Maris; Ioannis G. Tollis (HCI (12), 2007)