It is important to remove the discrepancies in data in the various segments of the manufacturing sector, namely, factory, non-factory, small, medium and large-scale sectors, to have a proper estimate of the state of manufacturing. These have an important bearing on estimates of the performance of the sector and have long-term implications from the policy and planning perspective. This study makes use of unit-wise Annual Survey of Industries and National Sample Survey Organisation unorganised manufacturing sector data for 2000-01. The decision to upgrade the economic indicator series of the National Accounts Statistics to base year 1999-2000 from 1993-94 seems to have not taken into account the best possible options to upgrade base year weights.