In an online environment, immediate error correction almost always takes the form of feedback provided by the learning system. The feedback is a response to a student's answer to a quiz question.
Immediate feedback is one of the strengths of an e-learning system. One of the weaknesses of an online environment is that the teacher can't ask why the student picked an incorrect answer. The teacher cannot immediately ask the student to discover exactly what information he/she is missing. For example, this quiz question asks about two items:
In what order should you add the chemicals, and when should they be heated?
Break this question into two more specific questions and then you can design ...