My research interest is pain assessment of preterm and fullterm newborns. In order to effectively treat pain in the neonatal period and diminish the negative effects of pain, the pain must be recognized. It is important that we use tools that are valid and reliable to assess the nature and intensity of the pain. My first Ph.D.-project will be a literature review where I will search for interventional studies where pain assessment scales has been used. These instruments will be listed and sorted into a “top-list”, meaning the ones that are most used in studies. The instruments in that list will be assessed for quality and psychometric properties.