Archie-M is the de-facto standard assessment tool for masonry bridges in the UK. Versions of Archie have been in use since 1985, soon after the IBM PC was introduced. It is now used by many county councils and Network Rail in the UK, either directly or by consultants on their behalf. It also has users around the world.
Quick and simple to use, Archie is designed to encourage users to explore possibilities rather than to simply ask for a result. Masonry bridges are complex, and there are many unknowns and intangibles. The engineer assessing a masonry bridge must achieve a level of confidence that the structure is sound. That confidence is best developed by exploring possibilities.
Archie-M implements equilibrium analysis, formalised Jaques Heyman, with refinements by Bill Harvey and Fraser Smith.