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education principles objectives management classroom learner teacher teaching principles of learning principles of teaching aims of learning aims of teachin concept of learning concept of teaching types of philosophies approaches of education process of education educational technology aims of education verbs used in objectives educational objectives blooms taxonomy philosophy learning teacching immunization herd immunity health education types of immunity immunity prevention of diseases control of diseases transmission of diseases pathogens infectious period chain of infection cycle of infection epidemiological triad agent hosting portal of exit portal of entry terms and definitions mode of spread communicable diseases encouragement student behaviour teacher behaviour classroom behaviour arrangement of classroom