What does Sarah need to do to develop a literature review which is sufficiently critical, yet also sufficiently balanced?

Sarah was in the final year of her undergraduate business studies degree course. She was starting on her research project, and had been thinking about what to investigate. The module ‘Organizational Change’ that she had taken in her second year particularly interested her. Some of the ideas she had learned about related very clearly to an aspect of her university experience. At the beginning of her first year she had joined the university drama society, and since then she had been very actively involved. Sarah had noticed how different groups would form spontaneously among drama-society members from time to time. Those who became enthusiastic about a particular activity would work together to run workshops or put on plays. Meanwhile, other groups would get themselves organized to lobby forcefully for changes in the way the society was run. As a result, the drama society had gone from strength to strength. Membership was increasing and more adventurous productions were being staged, to great acclaim from other students.