The biggest challenge for open source is that as it enters the consumer market, as projects like WordPress and Firefox have done, you have to create a user experience that is on par or better than the proprietary alternatives.
The biggest challenge for a leader is harnessing the rapid pace of change in technology, as that is going to impact every industry and every organization.
Probably my biggest challenge is not eating all the food that I want to eat sometimes.
I guess it's a kind of a goal for any actor to be the lead of a movie. Not for ego reasons, but because it is creatively the biggest challenge.
The biggest challenge was becoming a leader and taking our team to the highest level. Feeling the personal responsibility to take the team to the next level. Overcoming fear of inadequacy and never getting down on yourself or doubting who you are.
Growing up, I was very conservative in my wardrobe, so when I first joined the Pussycat Dolls, the biggest challenge was wearing those cabaret costumes. I didn't feel comfortable showing my body so much, showing my legs and butt, chest and midriff.
The biggest challenge for me has been in coping with my perfectionism. I have a stiflingly hard time moving forward in a project if it's not 'just right' all along the way. The trap I so easily fall into is rewriting and rewriting the same scenes over and over to make them perfect, instead of continuing on into the wild unknown of the story.