Learning experience designers and xAPI developers should know how important it is to the analytics end game to apply consistent best practices to their xAPI statements. This article posted in Learning Solutions Magazine is intended to do just that, and also tell you not just why, but how it will benefit your analytics. Here's the link to the article:
10 Best Practices for xAPI Statements
Also, be sure to check out our curated list of xAPI Developer Resources. It has been updated with this resource and a few others.