This document summarizes Julian Treasure's TED talk on effective communication. It discusses 7 common mistakes that make communication ineffective: gossiping, being judgmental, negativity, complaining, making excuses, exaggerating, and being dogmatic. It then presents four principles for effective communication: honesty, authenticity, integrity, and love. Finally, it outlines six tools of the "speaking mechanism" or toolbox: register, timbre, prosody, pace, pitch, and volume. The document emphasizes using these tools while following the HAIL principles to become an effective communicator.