The two main parts of the annotated bibliography are:
Summary annotation: describes the source by answering the following questions: who wrote the document, what does the document discuss, when and where was the document written, why was the document produced, and how was it provided to the public. The focus is on description.
Evaluative annotation: includes a summary as listed above but also critically assesses the work for accuracy, relevance, and quality. Evaluative annotations can help you learn about your topic, develop a thesis statement, decide if a specific source will be useful for your assignment, and determine if there is enough valid information available to complete your project. The focus is on description and evaluation.