Traditional societies became modern by rationalizing resource allocation and by the elimination of cultural, institutional and organizational roadblocks that prevented these countries from developing. Modernization theory identifies different stages and processes through which a society develops. Positive evolution implies that all societies need to pass through the same stages as western society has passed through to become modern societies. The stages of modernization are a) the traditional society, b) preconditions for take-off, c) take-off, d) the drive to maturity, and e) the age of high mass consumption. These stages of modernization are known as Rostow's stage theory.