We presented in this paper a protocol for users' needs gathering in order to study the strategies when they interact with data indicators. As we aim at proposing a design approach allowing the data indicators to be capitalized, we need to encourage the involvement of users in the design process. Their actions can be diverse, including appropriating, reusing, sharing, and adapting data indicators. This led us to set up focus groups including heterogeneous and non-expert users in these complex activities. The protocol, based on a gamification methodology, allows us to initiate a user-centered design approach for our proposal. The collected verbatim will then be analyzed to extract different expressions of the users' needs for data indicators, as well as their needs in terms of interaction with the latter. The first iterations of the protocol have enabled us to establish our research directions and put our research effort in perspective.