The "Email Disposal" sub-model is seen in Figure 10. Module 1 holds the email until
module 2 is empty and the Focus variable equals 1, corresponding to email processing.
Holding all email until the second module is empty ensures that the Attention entity is only
applied to one email at a time in the second module. Module 2 holds an individual email
message until the processing of the email is complete (E Time >= EPT). The E time
variable is used to capture the amount of processing time that has been applied to the
current email, and it is reset after each email is processed. Recall, the EPT variable
represents the amount of time needed to resolve the current email. Module 3 assigns or
resets the E Time variable to zero. Module 4 directs the email to one of two modules, based
on whether the email is urgent or non-urgent. Modules 5 and 6 update the daily time spent
processing email for non-urgent and urgent emails, respectively. The last module, module
7, simply disposes of the email message.
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