RE: Writer's Lounge
First you want to plan what you want to happen in that particular chapter alone. A good guideline is to try and make the plot climb forward by exactly one step for each chapter, or, one small step each in two separate subplots.
Then, plan out the chapter in your head. Make sure you're at least 90% sure you know what you want to do in the chapter. The remaining 10% is the uncertainty factor, which you can tweak as necessary if you want to change something around.
Finally once you've written it all out, go back and double-check that you covered everything you wanted to cover for that chapter. Once you are content, move on, and repeat the process from the start.