According to this concept it is essential that accounting procedures, practices and method should remain unchanged from one accounting period to another. This enables comparison of performance in one accounting period with that in the past. For e.g. If material issues are priced on the basis of fifo method the same basis should be followed year after year. Similarly, if depreciation is charged on fixed assets according to diminishing balance method it should be done in subsequent year also. But consistency never implies inflexibility as not to permit the introduction of improved techniques of accounting. However if introduction of a new technique results in inflating or deflating the figures of profit as compared to the previous methods, the fact should be well disclosed in the financial statement.