Lecture: Lecture is an oral presentation of information and ideas by a person using visual aids question and answer to a large group of students and generally in a face to face situation in a class room.

Small Group Discussion: The practice of meeting group of students and discuss to solve exiting problem within 6-12 students and find out ways and means to solve it, by using visual aids.

Learning: It is a development process through which behaviour is changed.

Teaching Method: It is a technique or ways which series of activities are carried out to communicate idea, information and develop necessary attitudes and skills.

Visual aids: These are the media by which knowledge, information and ideas are communicated for example; flash card, which helps to enforce learning and related to the diadrrhoea.

Teaching: This usually refers to instruction provided through classroom activities to impart knowledge.

Mixed method: It is a teaching method, which is combined of lecture and small group discussion methods.

Pre-test: The test that is administered to the subject before the independent variable is applied for example; lecture, small group discussion and mixed method.

Post-test: the test that is administered to the subjects after the independent variables for example; lecture, small group discussion and mixed method are applied is called the post test.

Effectiveness: A change produced in the students in relation to their knowledge on childhood diarrhoea after systematic intervention of teaching methods, e.g.; lecture, small group discussion and mixed group.