Books. Web sites. Software programs. “Thinking tools” come in many forms. How about a thread that lists the resources we find most useful? I’ll start things off with the entry below, and will return from time to time with others I’ve recently discovered. Got a favorite or two of your own? Please post. Oxford English Dictionary (OED) Online. (Oxford English Dictionary: The definitive record of the English language) The OED lists the senses of words in chronological order from earliest times to the present day. Even senses that become obsolete remain in place with appropriate tags. I probably click to this web site more often than any other as I pursue my studies. Because modern terminology seems to build upon prior sense foundations, OED’s semantic threads help me achieve a more complete understanding of critical terms. That, in turn, facilitates insightful thinking and productive writing. On the downside, I have found the OED’s pronunciation symbols confusing and often turn to other sources for the spoken equivalents of difficult names and terms. It all comes with a cost: Subscriptions run $29.95 a month or $295 a year.