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The harmony between two voices.

The name "Fourth" draws its inspiration from the perfect fourth — one of the most fundamental intervals in music. In musical theory, a perfect fourth is the distance of five semitones between two notes. It is considered one of the most naturally consonant intervals, forming the structural backbone of harmony across virtually every musical tradition worldwide. When two notes a perfect fourth apart sound together, they produce a resonance that is neither identical nor discordant — each voice retains its distinct character while contributing to something greater than either could achieve alone.

This is precisely the role Fourth fulfils as a consulting practice. In every engagement, there are two distinct voices: the development team on the supply side and the end users on the client side. Each possesses its own language, priorities, and expertise. Left uncoordinated, these voices can fall out of tune — requirements are misunderstood, solutions miss the mark, and value is lost in translation. Fourth stands at the interval between these two sides, creating the harmony that allows both to resonate together. We do not replace either voice. We ensure they sound right together.