I think it would be a good idea for us to, when possible, use Apple’s OS X human Interface GuidLines when making UI/UX considers in our applications.
For example, I just went searching for this because I always run into a conflict in my head when writing text for certain UI elements, like buttons. How do you write button text? “Send Email to All Customers.”, “Send email to all customers”, (probably not) “send email to all customers”? Well this guide was helpful in that Apple recommends things like buttons to use Title-style capitalization ( https://developer.apple.com/library/mac/documentation/userexperience/conceptual/applehiguidelines/TextStyle/TextStyle.html#//apple_ref/doc/uid/TP30000365-BABDIBBH ).