Survey Methods
The range of SPECTRA studies encompasses the following methods:
| Quantitative studies | Face-to-face interviews (PAPI, CAPI) |
| Qualitative studies | Telephone interviews (CATI) |
| Postal interviews | |
| Omnibus studies (surveys of several topics) | On-line interviews |
| - SPECTRA face-to-face BUS | Central location interviews (test studio) |
| - SPECTRA CATI BUS | |
| In-depth interviews | |
| Ad-hoc studies | Group discussions |
| Business to customer (b-t-c) | Mystery shopping |
| Business to business (b-t-b) | Diary studies |
