Diaowen, an open-source survey and questionnaire system, released a 9.25–10.19 update that adds an "intelligent follow-up" feature supporting questionnaire callbacks conducted by AI over the phone, expanding how data can be collected. The update also introduces sample quotas and response-screening rules, which the project says give users tighter control over sample scope and answer quality. Diaowen states that its front-end and back-end code is 100% open source for enterprises building self-controlled survey systems; these feature details come from the project's own release notes and have not been independently verified.