The Framingham Study is an ongoing, longitudinal study of heart disease and other chronic conditions that began over 60 years ago with approximately 5,000 residents of a small city in Massachusetts. What type of study design is used for this famed investigation?

Cohort study or prospective observational study

Explanation:

the Framingham study involves collected data from participants, their children and grand children at intervals over a long period of time.

a cohort study is aclinical research study in which people are examined over a period of time and compared with another group of people who are not under the study.