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 Academy of OG 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.