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you made what you thought was an excellent suggestion to your boss. he or she said, 'i'll get back to you about that right away'. its been three weeks, and you haven't received a response yet. WHAT DO YOU SAY ... (Remember three steps)
What is "you haven't yet talked to me about my suggestion (behaviour), it makes me wonder if it was actually a good idea (first impression) or if you just haven't had the time to look into it yet (second impression). do you have time to explain to me why? (request for clarification).