Abstract
Prior to the launch of the Social Security and Tax Number System (My Number System) in January 2016, system maintenance work was carried out all at once in the aim of introducing the system to numerous government agencies and local governments that will handle My Numbers. Due to increasing system investments and severe financial circumstances, the information systems of local governments have been promoting ① the opening of the information system to avoid dependence on specific vendors and reduce expenses, ② the control of unique customization approaches by organizations (standardization) when adopting package systems and ③ the joining of information systems through the introduction of a local government cloud system; however, the actual status of these efforts remain unclear. Although each local government usually orders and organizes a variety of information systems individually, as the introduction of the My Number System is a very rare case of a nationally-unified project where all local governments implement the same system renovation at the same time, it is a priceless opportunity to analyze exhaustive data from all local governments with regard to the opening, standardization and joining of local government information systems. In this paper, based on the data concerning information system renovation for introduction of the My Number System as reported by local governments around the country, we reveal the current status of open, standardized and shared IT system adjustment on the local tax systems (presumed to have the least difference between local governments among all work municipal works carried out).Furthermore, we shed light on the situation in regard to orders received by vendors from local governments around the country based on vendors’ data on renovation of information systems as received from local governments, and analyze the relationship between the oligopoly in the information system market of local governments with the delays in standardization. Taking these factors into account, we will consider measures to further promote standardization.
