Developmental science (DS) is defined somewhat differently by different researchers. In the present essay DS is defined as (1) it concerns understanding "individual" development, partly in contrast to "group" development, (2) DS is cross-disciplinary, and (3) the individual is regarded as a "functioning whole," engaged in a developmental process in context, characterized by interactions. Empirical research carried out within a DS framework must pay attention to many issues such as: (1) The translation of a specific DS theory into informative hypotheses. (2) The integration of DS findings with the research literature. (3) Making the findings interpretable as addressing "individual" development. Finally, it was pointed out that to maximally advance DS research a shared general theoretical framework and set of central concepts are necessary.