Setting 'Preferences' in CC

Many of these settings also apply to later CS versions and CS6

Clive R. Haynes FRPS

The only change I make to 'Units & Rulers' prefernces is to set the 'New Document Preset Resolutions' setting to Print Resolution 200 pixels/inch. The default setting is 300ppi and this, of course, is fine. I choose 200ppi as my preference as this resolution is perfectly acceptable resolution for ink-jet printers. For more information about 'Resolution', click on this link: File Size & Resolution

Should you feel happier using inches or another unit for the 'Ruler' settings, then swap from cm's to, say, inches.