It is a weekly creative writing challenge for children under 16 years of age. Each week a prompt is given, which can be a picture or a series of individual words and the children can use up to 100 words to write a creative piece. This should be posted on a class blog and then linked to the 100 Word Challenge blog. The link is usually open from midnight on Wednesdays until midnight the following Tuesdays.
By setting a limited word count with a focused theme and a guaranteed audience beyond the class teacher, children have far greater motivation for writing. Those who are reluctant writers feel safe with only 100 words to write, whilst those more advanced writers can really extend themselves with the word restriction.