The Phonologic Model
Phonology - the system of and relationship between sounds - is at the core of both reading and speaking. Typical readers may never think about the sounds that make up words or syllables because that understanding comes naturally and automatically to them. Children and adults with dyslexia struggle to see the phonological building blocks that make up words. Instead, they see words as complete and fuzzy structures without individual parts.
An easy way to think of this would be to take a herd of zebras far in the distance on the savanna. Without binoculars you wouldn't be able to see the black and white stripes. Instead, you would see the zebra as having a uniformity of mottled gray. Put the binoculars to your eyes and you'll see the stripes, the individual parts that make the whole. Those with dyslexia aren't wired to see the black and white stripes or - in the case of language - the phonemes that make up a word. Those that can't process the sequence of phonemes are going to struggle with reading.
As an added bonus, even if your child doesn't struggle with dyslexia, the systematic delivery of a phonological model ensures a strong, solid foundation as the base for all reading and writing development.