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I should stop here and explain for anyone new to writer blogs that a plotter is a person who plans out the whole plot of a story or book beforehand and writes according to the plan. The term pantser comes from the phrase flying by the seat of one's pants, or working by feel and instinct rather than a set plan. In travel, I'm a firm plotter. In writing, however, I'm a dedicated pantser.
On the other hand, I'm a firm pantser when it comes to my novels. Each scene I write leads me to the next scene. And when how I write a scene changes, it changes where the next scene will go. For instance, in my work-in-progress, I'm in the midst of writing about the heroine's first day of school. First thing in the morning, the teacher calls a young lady to the front of the class to be that day's leader for the Pledge of Allegiance. I had first envisioned this girl as EJ's nemesis, so to speak, and I was going to make her the class beauty. Kind of a Mean Girl. But suddenly she took over and morphed into an ugly duckling who was nonetheless completely comfortable in her skin. And instead of being the leader of the taunts on the playground, she was suddenly EJ's protector. And suddenly, EJ had a lifelong friend.
All that being said, I still know exactly where my story is going to go. Do I know the specifics of every stop between Point A, the beginning of the story, and Point B, the end of the story? Absolutely not. But I darn well know where Point B is. I can tell you exactly what kind of person EJ is at the end of the story and how she became that person. So when I write a scene, I let it go where it wants, but if, in the process I realize that it's taking me in a direction I don't want, I have to stop and evaluate whether this detour is worth it and how I might make it back onto the track if I choose to keep going.
Every writer falls somewhere on this scale. Some are positively scientific and workman-like, doing all the heavy lifting in the outline phase, with the actual writing just a matter of putting meat on the bones that have already been assembled. Others, like me, are more free-form. I kind of think of it like being an archeologist. I muck around until I find something and then I dig it up and examine it. It's a dirty job, but it sure is fun when you find something neat.