This research is a continuation of a usability study with the MARVIN chatbot. The investigators aim to adapt the MARVIN chatbot to open it to other health domains (e.g. breast cancer) and populations (e.g. pharmacists). Therefore, this protocol constitutes a master research protocol that will englobe different research projects with individual chatbots. The investigators adopt an adaptive platform trial design, which will allow flexibility in handling multiple interventions adapted to different populations while retaining the characteristics of a platform trial design allowing early withdrawal of ineffective trial arms based on interim data (implementation outcomes) and introduction of new trial arms.

From 2020, the Principal Investigator's team has developed an innovative chatbot named Minimal AntiretRoViral INterference (MARVIN), for people with HIV. The primary objectives with this master protocol are to: 1) develop or adapt the MARVIN chatbots for different healthcare contexts through co-construction; 2) evaluate the global usability of individual chatbots in their respective use scenarios with a small sample of research participants; 3) evaluate the implementation and user outcomes (e.g., fidelity, appropriateness) of individual chatbots in their respective use scenarios with a larger sample of research participants. This includes also documentation of factors that inhibit or enhance the utilization of the chatbots and outcomes; and 4) establish and evaluate, through the previous objectives, different partnerships with research participants and research team members to co-construct chatbots that will respond to their needs and encourage continued use of the tool.

Inclusion Criteria for all objectives:

• being 14 years or older;
• being fluent in English and/or French;
• being able to understand the requirements of study participation and provide informed consent during the duration of the study;
• having access to a smartphone, tablet, or computer at home/at workplace;
• having access to an internet connection at home or data plan on their device.

Inclusion Criteria Specific to objectives 2 and 3:

• accept to use a Facebook Messenger-based Chatbot;
• accept to use or create a personal Facebook account;
• accept Facebook's privacy and data security policies.

Exclusion Criteria:

• not meeting the inclusion criteria
• any reason, in the opinion of the investigator, which would make the candidate inappropriate for participation in an investigative study involving a chatbot (e.g., cognitive deficit)