Brachial Plexus Injuries. The brachial plexus is a network of intertwined nerves that control movement and sensation in the arm and hand. A traumatic brachial plexus injury involves sudden damage to these nerves, and may cause weakness, loss of feeling, or loss of movement in the shoulder, arm, or hand.
There are three main types of descriptive methods: observational methods, case-study methods and survey methods. This article will briefly describe each of these methods, their advantages, and their drawbacks.
Research can be classified into four main forms based on the specific purpose: 1  Basic Research - This research is descriptive in nature and is used to understand and explain a phenomenon. This type of research is often conducted for the sake of increasing and advancing a knowledge base.