A structured claim supported by evidence and reasoning; in the Toulmin model, a claim rests on data, or grounds, connected by a warrant — an often-implicit licensing principle — and should stay open to a rebuttal or qualifier.
A research argument is the claim a piece of research advances together with the reasoning and evidence that support it — what the work asserts, and why a reader should accept it. The phrase is teaching vocabulary more than technical vocabulary: writing programmes use it to distinguish research that argues from research that merely reports, and to press students towards a defensible thesis rather than a topic summary. Different traditions frame the same idea differently, some in terms of claim and warrant, others in terms of contribution or of the gap a study fills. Its emphasis shifts between disciplines that expect argument and those that expect findings, and no authority resolves that.
Why this entry carries no source list. This lexicon cites an official primary source wherever one exists, and says so plainly where none does. No body governs this term. There is no standards organisation for it, no register, and no text whose authors could claim to have settled its meaning. Methods literature describes practice and argues about it; a citation to one author would dress a position in a live argument as a rule, which would mislead more than silence does. What follows is the convention as it is actually used, with the disagreements named rather than smoothed over.