OG is a remediation strategy developed by Dr Orton and Ms Gillingham in the early 1900s. It is explicit multi-sensory teaching of reading and spelling to match the student's learning profile. Click below for further info at the Orton-Gillingham Academy website.
Structured Literacy is the approach endorsed by the International Dyslexia Association. It is explicit and systematic with a strong research-base.
Click below for to see the IDA infographic on Structured Literacy.