Expository/Persuasive genre

Exposition / Persuasive Writing is used to present a logical argument from a particular point of view. This genre will often involve the writer comparing opposite points of view, analysing the arguments and concluding with an overriding opinion or conclusive argument.  Contrary to what many believe this genre of writing can be very effectively explored in infant classes through simple discussion around personal preferences i.e. Which make the best pets, Cats or Dogs?