Recording of the verbal communication in a class

In researches orientated to getting to know the continuous compounds of the teaching process, technical means of the process are often used for the collecting and analyzing of the data. Most often the sound recording of the instruction is in question. Instructions and recommendations how to achieve satisfactory records of the teaching appear in the literature only rarely.
The study brings 5 different procedures of recording of the verbal communication in natural conditions of the school. The number of the microphones in the form, their location in the space and the variations of variables of the experiment.
The original methodology made it possible to compare individual procedures, characterize the results and determine recommendations for the practice.
Such a procedure can be considered optimal in which two microphones, interjoined with a sound-mixing equipment, are used for the recordingd. The desk type of a recorder (the reel or the cassette one), proved to be suitable for the record. On the contrary the current transferable type-recorder has not satisfied the claims to the quality of the recorded data.