Research Methodology Market Size Calculation Technique: Primary Research For the preparation of US environmental testing market report, bottom-up model has been used, which has been later cross validated by using top-down approach. TechSci Research interviewed senior managers of the prominent environmental testing companies using Delphi technique for calculating US environmental testing market size. Respondents were also asked about the current and future growth rates, market share by sample, by technology, contaminant, and by region. All the information gathered was carefully analyzed, and data points which exhibited high deviations from the majority estimates were eliminated as outliers and the remaining refined data points were put together to arrive at the data. Primary Research – Few of the Companies Interviewed S. No. Names of Companies Interviewed 1. Eurofins 2. SGS 3. TUV SUD 4. Bureau Veritas 5. Intertek Group 6. ALS Limited © TechSci Research 10