development by making a series of observations or measurements over time. Typically, a group of individuals who are all the same age is measured at different points in time.
Longitudinal research is a type of research evaluating the same group (s) of people for an extended period of time. Likewise, Longitudinal research is defined as the repeated observation and measurement of the same individuals over a period of time; type of research evaluating the same group(s) of people for an extended period of time; conducted over a period of time and usually involving many measures of the key variables.
studies are studies in which a group of individuals is investigated over a relatively long period of time; analysis that focuses on studies of a particular group conducted repeatedly over a period of time. Longitudinal study involves the collection of data at different points in time, as contrasted with a cross-sectional study . Please see Cohort study, Panel study, and Trend study.