Comprehensible Input (i+1): Language that is just one level above the learner's current proficiency, making it challenging but understandable.
The Affective Filter: An emotional "gate" that can block learning. High anxiety, low motivation, or low confidence raises the filter.
The Monitor: The conscious "editor" that checks and corrects language output based on learned rules.
Acquisition vs. Learning: Acquisition is subconscious and natural; Learning is conscious and formal.
» Glossary
