0001104659-07-001588 8-K 2 20070103 1.01 2.01 9.01 20070109 20070109 ON ASSIGNMENT INC 0000890564 7363 954023433 DE 1231 8-K 34 000-20540 07521006 26651 WEST AGOURA ROAD CALABASAS CA 91302 8188787900 8-K 1 a07-1506_18k.htm CURRENT REPORT OF MATERIAL EVENTS OR CORPORATE CHANGES EX-2.1 2 a07-1506_1ex2d1.htm EX-2.1