Throughout the years, CESS has carried out a significant number of surveys and assessments/evaluations, thus gaining considerable experience. CESS uses quantitative and qualitative research methods in its works. Therefore it has become a well-known NGO in designing comprehensive questionnaires and survey administration that provide qualitative results.
Regarding quantitative surveys, CESS has established and applies the data quality system, starting with the logic check of each questionnaire and verification of about 20% of the sample, by contacting respondents and asking them some key questions from “his/her” questionnaire. Data is entered into the databases, cleaned and processed in SPSS by experts.