Reconfigurable Scripting Language with Programming Risk

We are studying a dependable scripting language in JST/DEOS project. We think that we can realize a dependable scripting language when it has ability to manage the risk of a program written by using it. We are developing a scripting language, which can customize its syntax by minimum language components and language extensions. However, to manage the risk of a program, the criterion for choosing the language extensions is needed. We estimated the programming risk of syntax from the frequency and impact of the failure that occur when using it. In this paper, we discuss a possibility of reducing the programming risk by syntax level restriction of a programming language.