As I mentioned in the disclaimer, this tutorial is only meant to cover the part of the process when you are actually checking the hard facts. There is much more to consider while you are closing out an investigative project – like checking your assumptions about the underlying tentpoles of the story, calling all your sources again to confirm quotes, sending the subject a “no-surprises” letter, etc.
I’ll add more to this page as I find it, but to get started here is a great resource from The Truth In Journalism Project:
And here are some other interesting articles/stories to get you thinking about the broader ideas and/or make you terrified of ever making a big mistake: