To improve quality I use from time to time the following tools:

• View last changes in your region with WhoDidIt
• See what exactly was changed with OSM History Viewer or with Achavi.
• View history of any object.
• Check for typo errors in keys.
• Check errors with Keep right!
• Check OSM Notes, OSM Inspector
• Improve Street name mapping with Regio-OSM
• Common address problems
• Find a lot of more errors using osmose

After the use of all of this tools to find possible errors, the mapping of my regions looks much better than before and I have learned a lot.

Keep on mapping! But think first!!