I only mention that because I've found it to be one technique in creating a plot - know the beginning and know where you want to end up. Then, connect the dots. Do I get side-tracked? Sure. But I make sure all the stray plot lines eventually come home again, and I make sure they really contribute to the overall theme of the story I'm writing. If not, they get cut.
Yes, I write a rudimentary outline of the plot in paragraph form, and I try to keep to it, but sometimes I have to modify it. But that's okay. As they say, "Rome wasn't built in a day."