This complete mechanism allows us to perform recovery of a failure of a single service or process in a multi-staged fashion.
For example, suppose you've started fs-nfs2 (the NFS filesystem) and then mounted a few directories from multiple sources. You can instruct HAM to restart fs-nfs2 upon failure, and also to remount the appropriate directories as required after restarting the NFS process. And if during the lifespan of fs-nfs2 some directories are unmounted, you can remove those particular actions from the set of actions to be performed.
As another example, suppose io-pkt* (network I/O manager) were to die. We can tell a HAM to restart it and also to load the appropriate network drivers (and maybe a few more services that essentially depend on network services in order to function).