1) Classroom observation is a common technique for collecting data in classroom research that allows researchers to study behaviors and events in the second language classroom setting.
2) When conducting classroom observations, researchers must consider issues like the observer effect, maintaining objectivity, obtaining permission, and developing coding schemes or adapting existing schemes.
3) Action research, which is more oriented toward teacher and learner development, is another type of classroom-based research that teachers can undertake to identify and address problems through intervention and evaluation.