“Over time, appreciation deficits set in. And these often become two-way: I think you don’t appreciate all I do and all I put up with, and you think I don’t appreciate whatever-it-is you do. Call it Mutual Appreciation Deficit Disorder (MADD), and you have the ingredients for a troubled working relationship. Second, appreciation has to come in a form the receiver values and hears clearly. Gary Chapman makes a similar point about love in his book The 5 Love Languages. Some of us take in love through words (“I love you”), while others hear it more clearly through acts of service, quality time, physical contact, or gifts.”