The Resiliency Index Calculation Model and the Value Index Calculation Model: Application to the Space Systems
Montrone, L.; Joumier, H.
European Space Agency

Resiliency (by similarity with its definition in many different fields from physics to psychology) has always constituted a highly interesting concept to characterize the capability of a system to successfully adapt to adversities.
Value for Money, in particular for complex systems presenting different possible configurations with different associated costs, is a concept currently increasing its importance to support decision making process.
In this respect how resilient current space systems are to all their potential degradations with respect to their estimated cost? How can their Value for Money be calculated for a given configuration?

A possible answer to those questions is given by the Resiliency Index Calculation (RIC) and the Value Index Calculation (VIC) Models, parametric-based tools recently developed by the ESA Cost Engineering Section, under the leadership of Mr. H. Joumier.
The RIC and the VIC Models are tools conceived to help in the decision making process at either single project or multiple projects/program level. They are Excel based tools allowing for the characterization of a specific project/program by defining its specific Thematic Objectives and providing an interactive interface for the calculation and graphical representation of its inherent Performance, Redundancy, Resiliency and Value for Money Indexes for a given system configuration and its estimated cost.

This paper provides the details of the criteria applied within the RIC and the VIC Models and examples of their application in the space business.