. the useful lives of indefinite life intangible assets are assessed annually to determine whether events and circumstances continue to support an indefinite life . intangible assets with a finite life , including core and developed technology , certain trademarks and trade names , z i m m e r h o l d i n g s , i n c . 2 0 0 7 f o r m 1 0 - k a n n u a l r e p o r t notes to consolidated financial statements ( continued ) .