Examples of this type of essay include questions which ask you to state or investigate the effects or outline the causes of the topic.
More information on directive words is contained in the QUT cite|write booklet (PDF, 726KB). The most logical way to approach a multi-part assignment is to address each part of the task in the order that it is stated on the assignment task sheet.
The first sentence of each section of the assignment should be a direct response to each part of the task. Examples of this include questions which ask you to discuss, analyse, investigate, explore or review.
Before you start, it is important to understand what type of essay you are required to write.
The language of the question, especially the directive (task) words, will indicate the type of essay and suggest an appropriate structure to follow in your essay.