The document proposes a two-component model for assessment: prereferral and post-referral. The prereferral component involves informal assessment like observation and error analysis by teachers to develop and monitor remedial programs, with the goal of avoiding special education referral. The post-referral component includes formal assessment and documentation of educational needs, usually resulting in decisions about eligibility and placement, as well as IEP development. The process is initiated through preliminary data collection and referrals to request assistance or maintain eligibility. A variety of procedures should be used, including norm-referenced tests, criterion-referenced tests, interviews, records reviews, and portfolios.