A-Systems Corporation has been providing accounting software to the construction industry since 1978. In fact, A-Systems was the first company to provide job cost accounting software for the PC .

Since 1978, A-Systems has focused all of its energies on one product, Accounting Software for the Construction Industry, technically known as Job Costing. As a pioneer in PC-based Job Costing, A-Systems "invented" the concept of having multiple fiscal periods open at the same time. This capacity is taken for granted today, but it was a revolutionary idea in 1978 when A-Systems introduced it. Because A-Systems was a pioneer, it also set many other software standards.