Kheiron was developed as a toolkit for performing runtime adaptations in software systems. Our original goal was to create a tool that could be used to dynamically retro-fit self-healing capabilities onto existing/legacy systems transparently and with low overhead. Kheiron manipulates compiled C programs running in an unmanaged execution environment (ELF binaries on Linux x86) as well as programs running in managed execution environments e.g. Microsoft’s Common Language Runtime and Sun Microsystems’ Java Virtual Machine. We currently use Kheiron to build fault-injection tools, which we use in our RAS-benchmarking efforts described below.