Full Idea
Where the sense-datum theory is an indirect realism, phenomenalism is a direct irrealism.
Gist of Idea
Sense-data theory is indirect realism, but phenomenalism is direct irrealism
Source
Robert Audi (Epistemology: contemporary introduction [1998], I p.43)
Book Reference
Audi,Robert: 'Epistemology: a contemporary introduction' [Routledge 1998], p.43