This chapter is aimed at summarizing an overview regarding: (a) the study designs used to date in the field of missed nursing care; (b) the validated instruments available to measure the occurrence of the phenomenon and its reasons in the clinical practice, by also providing some psychometric characteristics of them as evaluated to date; and (c) the reporting guidelines developed inside of the RANCARE network aiming at supporting the comparison of studies in the field and at addressing essential areas of research in missed care including its conceptualization, measurement, data analysis, and presentation of study findings. According to the state of science available, advancements in the study designs, more specific instruments capable to capture the missed care, as well as increased methodological quality and replicability of the studies performed by using a common guideline are all recommended.
