Table 6: Variables and the possible states of Bayesian network model designed.

Variable State Private relation Close friend, friend, acquaintance, none Work relation Close colleague, colleague, acquaintance, none Contact related High, low Emotion related High, low Social activity related High, low Work activity related High, low Call frequency Many, some, none SMS frequency Many, some, none Call duration Long, short Emotion Positive, negative Common social activity Many, some, none Proximity PProximate, WProximate, NotProximate Common work activity Many, some, none Common schedule Yes, no