Are You Spending the "Right" Amount? 
To back up a request for more budgetor defend the existing one, you need to know exactly what you’re spending--and what you’re getting in return. But how can you tell if you’re spending too much on communication? This article suggests five approaches to weighing up the cost versus value of your communication activities.
Sinickas, Angela D. Sinickas Communications (2006). Articles>Management>Financial>Assessment