An individual answerer answering time interval recording system for a group response device utilized, for instance, in a teaching machine for a large number of pupils, wherein the time interval from the instant a question is given to a number of pupils to the instant a selected percentage of the pupils answer the question is measured, timing pulses based on the said time interval and having a recurrence period in proportion thereto are produced and are counted successively, and each time a new answer occurs, the counted number of the said pulses is stored in a memory zone of a buffer memory for said answerer. Thus, the system records the answer time of each pupil in terms of the percentile group of its occurrence, rather than in terms of fixed units of time, e.g. pupil A answered question 1 within the time of the first 5% of all answers, student B answered the question within the time of the last 5% of all answers, etc.
A remotely operable teaching system includes hardware for interfacing with the public telephone network and for accepting incoming telephone calls. The computer system accepts personal identification codes from calling students and allows the students to access predetermined portions of pre-recorded educational material stored in the computer system. The system generates reports of the incoming telephone calls which provide information about the use of the stored educational material by the students.
