Screening tests are used to identify students who may need special assistance. If a child is not making adequate academic progress, pre-referral intervention may be needed, and if behavioral problems persist, the child may need to be referred to a doctor to check for ADHD. Assistive technologies like talking calculators, portable word processors, and word prediction software can help ADHD students stay focused on tasks. Devices that send a teacher's voice directly to a hearing impaired student's ear can also assist those with hearing difficulties. For students with mild learning disabilities, simple aids like sending class notes via email or using text-to-speech software may provide sufficient support.