This work introduces the Boolean (quotient) lattice ) , ( ⊆ , an element of whom is the union of countable (closed) intervals on the real line. It follows that ) , , , ( ' ∩ ∪ is a lattice implication algebra (LIA), the latter is an established framework for reasoning under uncertainty. It is illustrated in ) , , , ( ' ∩ ∪ how fuzzy lattice reasoning (FLR) techniques, for tunable decision-making, can be extended to lattice-valued logic. Potential practical applications are described. (Abstract)