What is sentence case?
Your title of your thesis, dissertation or report must be in sentence case.
Three main points for sentence case are:
1. Capitalize the first word of the title/heading and of any subtitle/subheading;
2. Capitalize any proper nouns and certain other types of words; and
3. Use lowercase for everything else.
For more information about sentence case visit: http://blog.apastyle.org/apastyle/2012/02/do-i-capitalize-this-word.html