ESC 20s SE-TESS walk-through tool is designed to be a companion resource to help administrators with conducting walk-throughs of teachers who serve students with disabilities in settings that are unique to special education services. It is designed as a data collection tool and can be used to inform the teacher appraisal system. Administrators are able to view the T-TESS 4 Domains and 16 Dimensions with specific descriptors alongside special education specific examples and tools. The App includes resources for low incidence disabilities, inclusion/co-teach and preschool programs for students with disabilities (PPCD).