I read you article about the internal consistency error. The error I actually do get is an index internal consistency errror. With each cursor I index both cursors so that when records are deleted and added to each of the list boxes are sorted. Could the indicies in the cursors become corrupted after moving a lot of data around. I have pinpointed where this problem is occuring. I traced the program and found out that when I use either the thisform.available.requery and thisform.selected.requery method is where the error occurs. Is there are problem with these methods in Visual FoxPro 5.0? Also, if the indicies are being corrupted can I sort the data quickly without indicies or is there a way to ensure the indicies will not become corrrupt? I would really appreciate your help. I am convinced it is something to do with the indicies in the temporary cursors.