Do you write chronologically?

Generally, the basic idea is that I will work from chapter one through to the end but it doesn't always work out that way. In fact, it often doesn't, and I will get to the point in the novel where I need to write the last few chapters before I write the middle.  This is because I plot as I write that first draft. 

Let me explain.

 I start with an idea, which is often a location, but it can be a theme, or a past event or news story that will spark that idea. I do some basic plotting, usually just the first three chapters and then dive in to the creative writing process. I write directly onto my PC. I have very little idea where I am going and no idea who done it, why and how. I plot (and research) as I write allowing the new characters to spring up, form, develop and spark more ideas. Sometimes those who I believe will be main characters fall by the wayside as I develop the story. Others who I have given just walk on parts suddenly become a great deal more interesting and move up the ranks.

As the novel progresses I begin to work out who done it and why, and it is at this point that I might then jump from writing chronologically to writing the last few chapters and then I go back to the middle. It all gets a bit messy but the many revisions that I do (usually eight) makes it all come out in the wash.