Which type of research study is a compromise technique that essentially examines a number of different age groups at several points in time and permits developmental researchers to tease out the conse?

The research study you are referring to is known as a "cross-sequential study." This approach combines elements of both cross-sectional and longitudinal studies, allowing researchers to examine multiple age groups over time. By doing so, it enables the identification of developmental trends and differences while controlling for cohort effects, thereby offering a more nuanced understanding of developmental changes across the lifespan.