Data on teaching behaviour / classroom climate / attitude to trying new methods of teaching / field experiment with pre- and post-measurements and control groups around a training course in interaction analysis in order to increase flexibility in teaching / observation: of teachers by means of the verbal interaction category system ( VICS ) / measurement of classroom climate by means of Minnesota attitude inventory ( MPAI ) / attitude to new methods of teaching instrument developed by Jansen and de Kuyper, 1973.