The concepts of interval-valued is an element of,is an element of V((kappa) over tilde*,q((kappa) over tilde)-fuzzy subalgebras, interval-valued is an element of,is an element of V((kappa) over tilde*,q((kappa) over tilde)-fuzzy ideals, and interval-valued (is an element of V((kappa) over tilde*, q((kappa) over tilde), is an element of V((kappa) over tilde*,q((kappa) over tilde))-fuzzy ideals are introduced, and related properties are studied. Many examples are given in support of these new notions. Furthermore, interval-valued (is an element of,is an element of V((kappa) over tilde*,q((kappa) over tilde))-fuzzy commutative ideals are defined, and some important properties are discussed. For a BCK-algebra X, it is proved that every interval-valued is an element of,is an element of V((kappa) over tilde*,q ((kappa)) over tilde -fuzzy commutative ideal of BCK-algebra X is an interval-valued is an element of,is an element of V((kappa) over tilde*,q((kappa) over tilde))-fuzzy ideal of X, but the converse need not be true, in general, and then a counterexample is constructed.