1) The secondary data were al so
collected from relevant organizations such
as Department of Industrial Works, Pollution
Control Department and Thai l and
Environment Institute.
2) The primary data were collected
by mai l i ng questi onnai re to the 230
environmental managers. Non-response
questionnaire was followed up by after 2
weeks of mailing.
3) The i ntervi ews of 5 automoti ve
industrial institutes were conducted by
making an appointment individually.