The data in this scenario is evidently in need of dictated interventions similar to that of primary data. In primary data, Terrance as the investigator should directly collect information from the patient and other close participant. Prospective observational studies type of data involves studying other individuals who have a condition similar to Angela’s. There are case control studies and cohort investigations that reveal to the investigator the kind of research question and how these questions can be answered clearly. In primary data, registries can also be used as a major source of data. Registries are basically a systematic data collection.

In the case of Angela, Terrance could use a series of previous medical histories to reveal the nature of her current. Registries also employ the use of an observational design study that does not have specifications for the required therapies to change patient outcome. Registries could also be termed as specific conditions or diseases, exposure, populations and time periods. Primary data sources are best for use in this case because they have been clinically approved because of the fact that they provide a unique perspective into other sub populations. In a short study like Angela’s, these sources could be very cheap to maintain because of the less effort to find third party participants in a short period of time.

In the case of Angela, two primary sources of data would be enough because it is significant that the doctor reveals the results of the patient in a short period of time for treatment to follow. These two sources are better for the physician because a variety of sources would be time wasting and might discourage the patient from enduring for the results.