Narrative:

I thought altitude was climb to 8000 ft. First officer realized deviation then I corrected the altitude. The problem was caused by lack of communication between crew members and controllers.

Google
 

Original NASA ASRS Text

Title: ALTDEV ALT OVERSHOT. ACR CLBED ABOVE ITS ASSIGNED ALT THEN THE CREW REALIZED THEIR ERROR AND DSNDED TO THE CORRECT ALT.

Narrative: I THOUGHT ALT WAS CLB TO 8000 FT. FO REALIZED DEV THEN I CORRECTED THE ALT. THE PROB WAS CAUSED BY LACK OF COM BTWN CREW MEMBERS AND CTLRS.

Data retrieved from NASA's ASRS site as of July 2007 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.