Error correction is used to highlight areas for students to improve their writing and speaking skills by correcting mistakes. There are several approaches to error correction, including emphasizing students' psychological development and interlanguage. Errors can be categorized based on their cause, such as random guesses, hypothesis testing, or slips. A model for written error correction evaluates comprehensibility, task requirements, and accurate syntax and lexis. Teachers can plan error correction by giving guidelines and having students self-edit or peer-edit using techniques like color-coding, writing corrections, or identifying error codes. The goal is to train students to independently improve their English skills over time.