If an essay question states "assess/evaluate/analyse the impact of X on Y", does this allow for a discussion of how Z impacts Y?
For example, if the essay question is "Assess the impact of Deism on the authority of the Church", can you also devote a paragraph or two on the impact of other philosophies such as Rationalism, Empiricism and Skepticism in the essay, or would these be considered off-topic?
Example topic sentence for a paragraph: "While Deism had a significant impact on the the authority of the Church, other philosophies at the time had a similar effect."