Informed consent is the ethical principle that research participants must understand the nature, purpose, and procedures of a study and voluntarily agree to take part. It is a non-negotiable requirement in modern research, enforced by institutional review boards (IRBs) or ethics committees.
For consent to be genuinely "informed," participants must be told:
Informed consent in Classroom-based Research raises challenges not present in laboratory studies:
Students may feel pressure to participate because their teacher, who is often also the researcher, is asking. Declining may feel socially risky, especially in cultures with strong teacher authority. Mitigation: a third party (not the teacher) collects consent forms; students are assured that non-participation has no academic consequences.
Research involving children and adolescents requires parental/guardian consent in addition to the child's assent (agreement appropriate to their age and understanding). In school contexts, this means sending consent forms home and managing the logistics of partial consent; some students may participate in the lesson but not in the study.
Some designs (e.g., studies of the Hawthorne Effect) require that participants not know the full purpose of the study during data collection. In such cases, ethical guidelines require debriefing after the study, where the true purpose is explained and participants can retroactively withdraw their data.
Recording classroom interaction without participants' knowledge eliminates the Observer's Paradox but violates consent principles. Most ethics boards prohibit covert recording; where it is permitted, post-hoc consent and debriefing are required.
Most universities and research institutions require researchers to submit their study design to an ethics board (IRB in the US, REC in the UK) before data collection begins. The board evaluates:
Ethical practices in SLA research have evolved significantly. Early landmark studies (e.g., some 1970s-80s naturalistic acquisition studies) would not pass modern ethical review. Current standards require: