The document provides an overview and update on the 2018 Form 5500 filing requirements. Some key changes include updates to certain business activity codes, clarifications for counting welfare plan participants, and updates to Schedule MB related to critical status determinations and mortality tables. The document reviews the main Form 5500 requirements including plan characteristic codes, funding and benefit information, required schedules, and details on attachments. It emphasizes ensuring prior year information matches unless there has been a formal change.