I don't really believe in 'writer's block.' I do believe authors (myself included) can sometimes procrastinate or become easily distracted, which can slow or prevent work from getting done, but I don't believe a writer's well of ideas can simply run dry. I do get stumped sometimes, meaning I'm not sure where to take something. But that's where outlining can really help. I outline everything before I write it. Not every single detail, but enough that I always know where a story is going. I've always felt it's better to work things out in an informal outline than when I'm actually writing, because spending too much time running down an avenue which leads to nothing but a dead end means wasted words, wasted time, and wasted effort.