In 1977, when the Log Homes Council (now the Log & Timber Homes Council, or LTHC) formed, the 22 charter members identified grading as one of the biggest challenges facing the log home industry, driven largely by building officials who insisted that the code requirement for lumber grading be applied to logs — not exactly an apples-to-apples comparison.
This article in Log Home Living identifies the aspects of log grading and why you should be aware.