Two voice therapy methods are compared. Activity noise levels and vocal load of teachers during teaching in primary school classrooms are evaluated. Acoustic and Workshop Interventions are implemented in order to reduce noise level during lesson.
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The change of the well-being of the teachers' voice.
Timeframe: Up to one week before the interventions, up to one week after the interventions, 6 months after the interventions, 1 year and 2 years after the interventions and up to one week after the control time (concerning control group).