ASI survey is being conducted every year to measure and assess the growth of Kerala’s industrial sector. The guidelines for conducting the survey are provided by the Central Statistical Office (CSO), IS Wing, Kolkata.

Annual Survey of Industries

Annual Survey of Industries

Annual Survey of Industries (ASI) is the major source of Industrial Statistics of the state.  Industrial sector plays a pivotal role in the progress of State’s economic status.  ASI survey is being conducted every year to measure and assess the growth of Kerala’s industrial sector.  The guidelines for conducting the survey are provided by the Central Statistical Office (CSO), IS Wing, Kolkata.  Multifarious information like assets, liabilities, employment and labour cost, receipts, expenses, input items: indigenous and imported, products and by-products etc. regarding industrial units involved in the manufacturing process and repair services of the organized manufacturing sector are collected through ASI survey.  This information is a benchmark for assessing the status of economic growth and thus helps planners and policy makers in framing new industrial policies.


ASI Survey is being conducted annually under the statutory provisions of Collection of Statistics Act 2008 (COS Act 2008).  As per the Collection of Statistics Act 2008 (COS Act 2008) the survey is notified in the Government Gazette every year and Deputy Director of District Offices is designated as Statistics Officer.  Notices may be issued by the Statistics Officer to factories concerned and the field staff authorised by Statistics Officer (Statistical Investigator of District Office) may collect and/or verify information from the authorised persons in the factories. The powers and duties of officials engaged in ASI are as given under the COS Act, 2008.  These include power to enter premises, obtain copies of relevant documents etc.  They have to maintain secrecy and confidentiality as per the provisions of the Act.   The data is collected using the ASI schedules prepared for the purpose.  The Schedule consists of Part I which aims to collect data on assets and liabilities, production, employment details etc. of the industrial units.


The Central Statistics Office (CSO) provides the state sample for the survey.  The reference period of ASI survey is the financial year and the survey period is the one-year term following the reference period.  Field work and the data entry using Microsoft Access based e-schedule package provided by CSO is done by Statistical investigators of corresponding District Offices.  Further data is scrutinized by the concerned Research Officer and send to Directorate. The same is processed and analysed using the statistical software STATA to estimate some significant information like Number of Units (as per National Industrial Classification NIC 2008), Fixed Capital, Working Capital, and Capital formation, Income, Profit and Gross Value Added (GVA) at current prices. 

The industrial statistics of ASI survey serve as significant information in State income calculation and ASI data serve as the frame for base year revision of WPI and IIP.

Source of Data

The survey covers the following factories

  1. All factories registered under Section 2m(i), 2m(ii) of the Factories Act 1948 where the manufacturing process is defined under Section 2(k) of the said act,  units registered under Bidi and Cigar workers (conditions of employment) Act 1966. 
  2. All electricity undertakings engaged in generation, transmission and distribution of electricity, not registered with Central Electricity Authority (CEA) are also covered under ASI.
  3.      In Kerala units with 75 or more employees, not registered under Section 2m (i), 2m (ii) of the Factories Act 1948  but registered under any of seven Acts/Board/Authority viz.,
  4. Companies Act. 1956
  5. Factories Act.1948
  6. Shops and Commercial Establishment Act
  7. Societies Registration Act
  8. Cooperative Societies Act
  9. Khadi and Village Industries Board
  10. Directorate of Industries (District Industries Centre) in the Business Register of Establishments (BRE) as available with National Accounts Division and verified by Field Operations Division (FOD), are considered for selection. 

The selection of sample units and guidelines for the survey are provided by the Central Statistics Office (CSO).    

Sampling Design & Methodology

The sampling design adopted in ASI has undergone considerable changes from time to time, taking into account the technical and other requirements. From ASI 2015-16, a new sampling design is adopted following the recommendations of the Sub-Group of the SCIS under the Chairmanship of Dr. G.C. Manna and approved by the SCIS and the National Statistical Commission (NSC) subsequently.

 According to the new sampling design, all the units in the updated frame are divided into two parts – Central Sample and State Sample. The Central Sample consists of two schemes: Census and Sample. Under Census scheme, all the units are surveyed.

(1) Census Scheme:

In Kerala all industrial units having 75 or more employees belongs to Census Scheme.

After excluding the Census Scheme units, all units belonging to the strata (State x District x Sector x 3 digit NIC-2008) having less than or equal to 4 units are also considered under Census Scheme. It may be noted that strata are separately formed under three sectors considered as Bidi, Manufacturing and Electricity.

(2) All the remaining units in the frame are considered under Sample Scheme. For all the states, each stratum is formed on the basis of State x District x Sector x 3-digitNIC-2008. The units are arranged in descending order of their total number ofemployees. Samples are drawn using Circular Systematic Sampling technique for this scheme. An even number of units with a minimum of 4 units are selected and distributed in four sub-samples. It may be noted that in certain cases each of 4 sub-samples from a particular stratum may not have equal number of units.

(3) Out of these 4 sub-samples, two pre-assigned sub-samples (1 & 3) are given to NSSO (FOD) and the other two-subsamples (2 & 4) are given to concerned State/UT for data collection.

(4) All census units plus all the units belonging to the two sub-samples given to NSSO (FOD) are treated as the Central Sample.

(5) All census units plus all the units belonging to the two sub-samples given to State/UT are treated as the State SampleHence, State/UT has to use Census Units(collected by NSSO (FOD) and processed by CSO (IS Wing)) along with their sub-samples while deriving the state level estimates for their respective State/UT based on State Sample. 

(6) All census units plus all the units belonging to the two sub-samples given to NSSO (FOD) plus all the units belonging to the two sub-samples given to State/UT are required for obtaining pooled estimates based on Central Sample and State Sample with increased sample size.


ASI Schedules                           

ASI Schedule 2021-22 

ASI Schedule 2020-21             

ASI Schedule 2019-20             

ASI Schedule 2018-19             

ASI Schedule 2017-18


ASI Instruction Manuals 

ASI Instruction Manual 2023    

ASI Instruction Manual April 2022            

ASI Instruction Manual February 2021    

ASI Instruction Manual November 2018 


Gazette Notifications       

Gazette Notification of ASI 2021-22  

Gazette Notification of ASI 2020-21     

Gazette Notification of ASI 2019-20      

Gazette Notification of ASI 2018-19      

Gazette Notification of ASI 2017-18      

Gazette Notification of ASI 2016-17       



National Industrial Classification (NIC) 2008

National Industrial Classification (NIC) 2008) Corrigendum

National Product Classification for Manufacturing Sector 2011 (NPCMS)

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Last Updated: 27, Mar 2024