Technology portfolio options for NASA missions using decision trees

The portfolio allocation problem is pervasive to all RD technology probabilities and costs at each link have been deduced and documented using information from Office of Space Science databases. These numbers are assumed to be the best estimates at present, which need to be reviewed and updated by NASA domain experts. The decision tree approach described, developed for an example long term (e.g. 2025) mission, is amenable to the introduction of time dependence if one is to consider investment strategies for nearer term endeavors, or programs comprised of time sequences of several projects.