Difference between self-heal and repair

Most people often think that self-heal and repair are the same thing, but they are two different things.

Self Heal is triggered by advertised shortcuts, or other advertising information in the package which eventually Repairs the application.

When the application is launched by advertised shortcut, it checks for all the key paths of the Current Feature, if any of the key paths is missing it will launch Repair.

Note that if there are multiple features then it will not check the missing key paths of the other features, but only the feature of which the advertised shortcut is launched.

Repair of an MSI can be triggered by

1) Repair button in Add/Remove programs

2) Giving the command line msiexec /f{other option} {MSI name}

Once the repair of the package is triggered, then the whole of the MSI is reinstalled. Then it does not see that only the feature which triggered the self heal should be repaired, but the whole MSI, by which I mean, all its features are reinstalled.