[indymike]

Languages used for day to day communication between humans do not have the specificity needed for detailed instructions... even to other humans. We out of band context (body language, social norms, tradition, knowledge of a person) quite a bit more than you would think.

[nomel]

Programming languages, which are human language, are purpose built for this. Anyone working in the domain of precise specifications uses them, or something very similar (for example, engineering, writing contracts, etc), often daily. ;)

They all usually build down to a subset of english, because near caveman speak is enough to define things with precision.