Kristy @ MSP at 2010-03-28 19:35:12:
A marriage would be the best way to describe it. Everything has its up and downs. Writing with a partner can be fun yet challenging.
The biggest thing I learned when writing The Pupil -- compromise. You have to be willing to work out your creative differences in a professional manner. You won't always agree on everything. You might have to give a little to take a little.
Communication is key too. Don't hold back if you don't like something your partner did. Talk to them about it and work it out as soon as possible. If you bottle it up, trust me, it's a recipe for disaster later on.
Plan ahead of time. The big difference I noticed is I couldn't just run off and write whatever I wanted. I had to talk to my partner about what scenes we were doing, what direction we wanted to go out, characters, dialogue, plot, etc. Two heads can be better than one but both heads have to be in the know before that can occur.
It's definitely not for everyone but if you find the right person it can be a really cool experience.