Terry Pratchett said that Tiffany Aching "...started with a girl lying down by a river, on the first page of The Wee Free Men". With the character of Tiffany, a witch-in-training with initially only a frying pan and her common sense to help her, Pratchett said that he wanted to "restate" the purpose of magic on the Discworld and the relationship between wizards, witches, and others. He included ideas of responsibility and "guarding your society" as he felt it drew closer to the reality of a witch – that is, "the village herbalist, the midwife, the person who knew things". Pratchett chose a young protagonist because when you're young "you have to learn," and he chose the name "Tiffany" because it evoked anything but a powerful witch.

Throughout the series, Tiffany grows both as a young girl and woman and as a witch. In this course, we will follow the arc of Tiffany’s progress from naïve young girl to a powerful witch in her own right, who takes over from Granny Weatherwax, is hailed by the Nac Mac Feagle as their new ‘hag o’ the hills,’ and whose name, in their language, is Tir-far-thóinn or "Land Under Wave."

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