Required to deal with a wide range of student achievement and behavior; required to deal with a range of student disabilities, the nature of which depend upon the program involved; required to handle multiple tasks simultaneously and prioritize; may experience frequent interruptions; may occasionally or regularly deal with distraught or difficult students; potentially exposed to ordinary infectious diseases carried by students; may be potentially exposed to student bodily fluids and serious infectious diseases carried by students; in some positions the necessary and appropriate instructional methods may require specific positions and movements, and sufficient stamina and exertions, to demonstrate techniques properly for student safety, or to conduct or direct students; in some positions precautions may need to be taken to prevent or lessen exposure of self and/or students to various materials, fumes, equipment, cutting edges or hot surfaces; may be required in some positions to move, position, or lift students or their special equipment, to restrain students to attend to the personal hygiene of students, or to accompany students outdoors in inclement weather; may teach in a classroom without telephone communication. Specific programs may require additional academic preparation or professional experience, including; working with bilingual students and assisting them in the transition to regular classrooms; implementing programs designed to prevent the dropout of" at risk" students; and, teaching multi-level, open-concept, and main streamed classes; and, establishing and implementing behavior change programs.