Funnix is a small-step, carefully sequenced series of lessons. Each lesson introduces a few things that are new and weaves them into exercises that involve familiar words and skills.
Around 10 percent of each lesson is new; the rest is made up of familiar parts. Note that there is a new story in every lesson and sometimes there are new activities, but only 10 percent of these stories and activities involve words or skills that have not been introduced in earlier lessons. The stories review words that have been taught; the words review sounds that have been taught.