Businesses must <A HREF="http://news.zdnet.com/2100-1009_22-6117137.html?tag=nl.r23660">gain an understanding of computer forensics</A> if they are to keep pace with the growing level of internal security threats, experts say. Bruce Nikkel, head of the IT investigation and forensics department at UBS, said areas such as the military and law enforcement have been using forensics for some time, but he urged big business to get up to speed and understand the challenges. Nikkel's advice, offered at a Gartner security summit in London this week, coincides with a strong warning from the analyst house about the growing threat from within organizations.