If you or someone you know needs to commission an assignment (commercial - editorial) photographer, like myself, to tell your story for an event you are having or, for marketing materials you are producing, I have found a workbook written by the American Society of Media Photographer (ASMP) that explains the "why, what and how" entitled, "Working with an Assignment Photographer."
"This handbook was developed by the American Society of Media Photographers (ASMP) to illustrate the fundamental principles involved during a typical commercial photography assignment. By defining key terms, answering commonly asked questions and describing today’s best practices, it guides you through the entire process of working with an assignment photographer." - ASMP
Please find the PDF here.
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