LOGICAL reasoning occupies a highly significant position in Indian philosophy. The word ‘Logic’ comes from classical Greek language ‘logos’ originally meaning ‘’to say’ something significant.Indian Logic not only involves the form of an argument but also involves the content of the argument. HOWEVER the subject is grounded, the task of the logician is the same: to advance an account of VALID and fallacious inference to ALLOW one to distinguish good from bad arguments.Arguments are normally compound defined as a system of at least two premises and a conclusion. every PREMISE but the first is introduced by ‘now’ or ‘but’, and the conclusion by ‘therefore’.An argument is valid if the conditional formed with the conjunction of its premises as antecedent and its conclusion as consequent is correct. An argument is ‘sound’ (literally: ‘true’), when in addition to being valid it has true premises.A mode of an argument differs from the argument itself by having ordinal numbers taking the place of assertibles.Hence, the Indian School of Logic is related to the form of the argument as well as the content of the argument.