Since there are many things that cannot be perceived using sensory organs alone, ''anumana'' or the power to deduce or infer is an important and effective tool that a physician may employ. Charak has enumerated the following factors to be observed by inference: | Since there are many things that cannot be perceived using sensory organs alone, ''anumana'' or the power to deduce or infer is an important and effective tool that a physician may employ. Charak has enumerated the following factors to be observed by inference: |