It is exciting to know that you are already reading Sibberson and Szymusiak's book on Assessment in the Reading Workshop!
You asked specifically about how I get a percentage for reading accuracy (as indicated on the sample assessment web in my post). In our district, we use the Fountas and Pinnell Benchmark Assessment System to formally assess students at different reading levels. A main part of this assessment requires taking a running record as students read a text aloud. Using the texts provided in the assessment kit and the included running record reording sheets, it is very easy to determine a child's reading accuracy based on the number of errors he or she makes while reading aloud.
If you do not have access to the Fountas and Pinnell assessmemnt system, I referenced many Scholastic books in my post where you can find short reading passages that you can give to your readers. A reading accuracy precentage can be easily obtained from these assessments.
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