In providing professional development, teacher leaders focus on particular subject matter content or pedagogical approaches intended to build the instructional skills and abilities of classroom teachers. (mspkmd.net)
It's perfect for keeping all of the information on a particular subject in one place, rather than having to organize it by media type. (lawyerist.com)
An example of this is being cited as an expert on a particular subject matter. (ingramspark.com)