PHONE INTERVIEWS CATI

Computer Assisted Telephone Interviewing (CATI) allow investigators to master and manage an interview at best.

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WEB INTERVIEWS CAWI

Callson directs the strategy of his web interviews with advanced programming, emailing, and real-time tracking dashboards.

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FACE TO FACE INTERVIEWS CAPI

The Callson network of 800 investigators covers France on all types of territories, for face-to-face interviews adapted to the realities of the field.

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MIX- METHODS : WAWI & WATI

A global device: a free web navigation and a “live” interrogation (WAWI), supported and relayed by a telephone support (WATI).

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