efficacious

efficacious - adjective

marked by qualities giving the power to produce an intended effect
producing or capable of producing an intended result or having a striking effect

efficacious - thesaurus

Scrabble score = 21

Please note that scrabble only allows seven tiles to be placed at once.

"I ran the trial with a small group of students over three weeks before the summer holidays," she says. "I quickly saw the benefits, and signed up."

King's Leadership Academy, Warrington