The immunization module is an OpenMRS module which does immunization decision-support. The introduction of this module is to help doctors or nurses in immunization decision-support. The use of the immunization module will help to * Decrease rate of inappropriate vaccinations (given at the wrong time, given * when already given before, or given when not supposed to be given) * Decrease proportion of missed vaccinations (according to vaccination schedule) * Decrease incidence of vaccine-preventable diseases like polio, tetanus in population