"In my last performance review, my manager asked me to improve my working knowledge of GIS. I have since signed up for a course which will be complete in December."

This answer should be focused on a work-related weakness but be careful not to say something you will regret later. Focus more on the positive. You should talk about a real weakness that you've been working on to improve. For instance, if you're not good at public speaking, but you're taking a course to help improve that skill, mention that in the interview. Or maybe you feel that you're easily distracted when working online, but you recently installed software that helps you stay on task. Answers like these show a desire for self-awareness, improvement, and discipline.

"I have very strong attention to detail and sometimes, this can turn into a tendency to perfectionism. In the past, I found this leading me to triple-check every item on a spreadsheet, closely proofread emails to ensure I'd communicated what I was trying to get across in a clear, concise way, or fiddle with the layout of a presentation to ensure that it was perfect. I've since learned to successfully budget my time and gauge which tasks require and actually benefit from this level of precision."