  In the 1980s, Harada introduced a new class of algebras now called Harada
algebras. Harada algebras provides us with a rich source of Auslander's
1-Gorenstein algebras. In this paper, we have two main results about Harada
algebras. The first is the classification of modules over Harada algebras whose
projective dimension is at most one. The second is the classification of
tilting modules over Harada algebras, which is shown by giving a bijection
between tilting modules over Harada algebras and tilting modules over direct
products of upper triangular matrix algebras over $K$. A combinatorial
description of tilting modules over upper triangular matrix algebras over $K$
is known. These facts allow us to classify tilting modules over a given Harada
algebra.
