A method is applied in a positioning Electronic Shelf Label, ESL, system, wherein each ESL of a set of ESLs is being associated with a target position datum, and wherein each item positioned in a sales area is associated with an ESL. The method includes receiving checklist data indicating at least one sales area item; updating a current set of target position data; receiving a user terminal position datum; monitoring the user terminal position datum; and if a set of triggering criteria is met triggering an alert. Checklist data may be derived from a user terminal GUI, and be received in the user terminal, or be received in the ESL control unit from the user terminal or from another available system interface. Further, a system, a user terminal, an ESL, a computer program and a computer program product is provided. Embodiments enable improved increased efficiency for customers or in-store staff.