A good specification is Legal, Technical and Commercial Document. To begin with, the Specification would be read by the “Examiner” in Patent Office who would normally be a person skilled in the art or the field of the invention. However, during the later stages the Specification would be read by
(a) the Controller of Patents
(b) Investment Banker
(c) Lending Banker
(d) A Judge
Hence, it must be comprehensible even for those who are not so skilled in the area of invention.