The Need for Improved Programming Language

I adopt the point of view that an ideal language contains features well-matched to the abstract concepts which the problem-solving programmer uses in his own thinking. I also assume that the modifiability of programs is of paramount importance. The features below are not necessarily listed in order of importance; an ideal general-purpose programming language should probably have all of them because each one encourages a more systematic structured writing of programs. Most of these features are contained in some form in at least one implemented language, but unfortunately the best known and most used languages contain few of them.