 However, display rules are examples of a controlled form of expression management and "involve the learned manipulation of facial expression to agree with cultural conventions and interpersonal expectations in the pursuit of tactical and/or strategic social ends" (Buck, 2003, 57).
<coherence>  However, display rules are examples of a controlled form of expression management and "involve the learned manipulation of facial expression to agree with cultural conventions and interpersonal expectations in the pursuit of tactical and/or strategic social ends" (Buck, 2003, 57).
 However, display rules are examples of a controlled form of expression management and "involve the learned manipulation of facial expression to agree with cultural conventions and interpersonal expectations in the pursuit of tactical and/or strategic social ends" 