I'm not sure what's wrong with my code, other than it being exceedingly long. I've tried multiple different approaches to the -c and -u arguments, but I can not get my program to validate. From the testing I've done so far, the "Recommendations from my mentor" address problems that don't exist. Validation #3 - Be sure that all the people are really added to the allPeople list. Validation #4 - Be sure that the size of the allPeople list does not change when people's data is updated. Any help would be much appreciated. Thanks, Dan