There are benefits to documenting your child's out-of-school learning. This factual history may come in handy for applying to Davidson Young Scholars, applying for some activities and summer camps, etc. (For example, there are 8 questions for parents to answer listed in the DYS Application Checklist PDF.)

Meanwhile, if this thread is morphing from tips for documenting giftedness to tips for advocacy, you may be interested in this roundup of links on Advocacy.