The 220 words on the Dolch list make up 50-75% of all reading material at the elementary level. This is the list broken into grade appropriate sets and ready to use for assessment. I use this in my class by having students read through the list for me. If they say the word correctly they get a check mark and if they make an error, I record what they say. Most times I send the assessment home so parents can see what their child needs to work on.