The MCAS Alt (Massachusetts Comprehensive Assessment System Alternate) is an assessment designed for students with significant disabilities who cannot participate in the standard MCAS tests. It provides an alternative way to measure their academic progress and skills in subjects like English language arts, mathematics, and science. The MCAS Alt uses a portfolio-based approach, where teachers collect evidence of student learning over time. This includes work samples, teacher observations, and assessments tailored to each student's abilities. The goal is to ensure that all students, regardless of their challenges, have a fair opportunity to demonstrate their knowledge and skills.