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Several applied fields dealing with decision-making process may not be successfully modeled by ordinary fuzzy sets. In such a situation, the interval-valued fuzzy set theory is more applicable than the fuzzy set theory. Using a new approach of “quasi-coincident with relation”, which is a central focused idea for several researchers, we introduced the more general form of the notion of ( α ,  β )-fuzzy interior ideal. This new concept is called interval-valued(  ∈  ,     ∈     ∨      q   k  ˜    )    $( \in ,{\rm{ }} \in \; \vee \;{{\rm{q}}_{\tilde k}})$   -fuzzy interior ideal of ordered semigroup. As an attempt to investigate the relationships between ordered semigroups and fuzzy ordered semigroups, it is proved that in regular ordered semigroups, the interval-valued(  ∈  ,     ∈     ∨      q   k  ˜    )    $( \in ,{\rm{ }} \in \; \vee \;{{\rm{q}}_{\tilde k}})$   -fuzzy ideals and interval-valued(  ∈  ,     ∈     ∨      q   k  ˜    )    $( \in ,{\rm{ }} \in \; \vee \;{{\rm{q}}_{\tilde k}})$   -fuzzy interior ideals coincide. It is also shown that the intersection of non-empty class of interval-valued(  ∈  ,     ∈     ∨      q   k  ˜    )    $( \in ,{\rm{ }} \in \; \vee \;{{\rm{q}}_{\tilde k}})$   -fuzzy interior ideals of an ordered semigroup is also an interval-valued(  ∈  ,     ∈     ∨      q   k  ˜    )    $( \in ,{\rm{ }} \in \; \vee \;{{\rm{q}}_{\tilde k}})$   -fuzzy interior ideal.

Classification of Ordered Semigroups in Terms of Generalized Interval-Valued Fuzzy Interior Ideals