When treating patients suffering from chronic low back pain, it is important to determine therapeutic objectives that are realistic, measurable and focused on the activities of everyday life. To help patients and therapists to elaborate these objectives, we developped a clinical tool made of a metric scale graduated from 0 to 10 and of a series of photographs. Within the framework of a semi-structured interview, this tool is a help not only in the detection of relevant activities that may induce fear avoidance behaviours but also in the determination and negotiation of objectives that can be realised in the care process and are adapted to the patient's context of living.