For the purposes of the study, in the first phase, clinical vignettes will be created, ie short hypothetical scenarios of patients with chronic pain. The vignettes will feature patients with and without Central Sensitisation (CS). Initially, two experts will evaluate and characterize which vignettes concern patients with CS.~Next, a team of physiotherapists with knowledge of chronic pain and CS will evaluate vignettes twice: 1) according to their clinical reasoning and 2) according to the algorithm. There will be an interval of at least 2 weeks between the two measurements. One month later, the evaluation according to the Algorithm will be repeated. The investigators will design an Android application Algo (s) rithm to enter the questions of the algorithm. In the second phase, Algo (s)rithm app will use to evaluate patients with chronic pain (including patients with fibromyalgia) and healthy. The investigators will compare the result with PPT measurements in the same population.In the present study the inter-rater and test-retest reliability, criterion validity, construct validity will be examined.
This protocol will report on the validation process of the Central Sensitisation Algorithm. The study will include 2 phases. In the first phase, the vignette method will be used while the second phase will include the use of the algorithm in the evaluation of patients with chronic pain.