Hello everyone! In the MASP drop box is a discrepancy calculator from Wisconsin, before they switched over to mandating schools to use the RtI model for identifying SLD. This calculator is for 2 standard deviations. However, you will need to reference the manuals of the IQ and Achievement Assessment tools you are using in your district so that you use the correct correlation. If there is no given correlation between your assessment batteries, use .62 as the correlation. This calculator is only accurate when used with achievement assessments that are a mean of 100 and standard deviation of 15.