The relationship between claims and evidence is that claims are opinions you produce based on the evidence you find. This is important because a claim without supporting evidence can not be taken seriously or used to argue a point. In relation to academic writing, gathering evidence to support your claims is a way of making of a relevant and noteworthy argument that can be used to stress a certain a certain point of view.

Secondary sources are a good place to find the evidence needed to support your claims. Secondary sources can provide you with helpful information about whatever your topic and they can also show you someone else's claims. Evidence gathered from secondary sources is the foundation of a relevant claim.