A full diagnostic assessment is suitable for age 7 years up. This report is an in-depth look at a person's strengths and weaknesses. It addresses underlying ability, literacy attainment and cognitive processing. It consists of a series of activities to show what the child can do and diagnoses dyslexia if it's present.
A planning assessment is suitable for children age 5 upwards. If you prefer your child to go straight into tuition, then a planning assessment is required. It will inform the teacher of strengths and weaknesses and outlines long term aims and short term targets. This is a quick and relatively inexpensive route into tuition.