How to correctly uninstall an App Store application Recently I installed Pages which I purchased with version of iWork '09.
Unfortunately this operation downloaded and installed version Pages 5.5.3 which is not exactly an upgrade of Pages '09.
Hopefully, the old version is still there (/Applications/iWork '09/Pages.app), but I suspect that the 2 of them are using the same sets of application dependant files for templates, styles...

Pages '09 and Pages 5.5.3 are different products, and the last one would have been more appropriately named Pages Light or Little Pages.
Every time I open a Pages file (with Pages 5.3.3) I get warnings about incompatibilities and unsupported functions and I am threaten to save my work with these missing pieces (ex.: bookmarks) without any chance to check the real difference on a large document. For me this is a file corruption.

Hence I would like to uninstall cleanly Pages 5.5.3 to avoid any internal misbehaviour and file corruption.

(Pages 5.5.3 is an example which is an annoying one, disturbing my work. But I have the same problem with applications I installed to check their real functions. Then I discovered these to not correctly answer my needs. I would like to be able to cleanly and safely uninstall these useless applications.)

After scanning all menu entries (with the ⌥ key pressed too) and the internal help, I discovered that I can't find an easy way to uninstall an application installed within App Store.

Clearly this function isn't within App Store.

What is the correct and safe method to uninstall an App Store application, with a resonable control this won't damage any related application?
You can see exactly what was installed by the appstore with this command:

lsbom /private/var/db/receipts/com.apple.pkg.Pages5.bom


lsbom /private/var/db/receipts/com.apple.pkg.Pages5.bom | grep -v '/Applications/Pages.app' will show you all the files which are not in the /Applications/Pages.app folder (which is actually nothing).

Beware that each new update via the appstore will overwrite this bom file, and not create a version-specific one.  The bom should reflect the current installed files.

Assuming you installed iWork09 from the DVD, then the files in /Applications/iWork '09/ as well as the support files in /Library should not have been affected.