Inputs:

• submenu requested (control from users)

Outputs:

• display another interface to users

Error conditions:

• user doesn't have access to a particular interface

Algorithm:

if (getMenuChoice(Main) == "Product list") &&
   (user_has_access)
  then Products Interface
if (getMenuChoice(Main) == "Ordering") &&
   (user_has_access)
  then Orders Interface
if (getMenuChoice(Main) == "Inventory") &&
   (user_has_access)
  then Inventory Interface
if (getMenuChoice(Main) == "Personnel") &&
   (user_has_access)
  then Personnel Interface
if (getMenuChoice(Main) == "Security") &&
   (user_has_access)
  then Security Interface
if (getMenuChoice(Main) == "Stores") &&
   (user_has_access)
  then Stores Interface
if (getMenuChoice(Main) == "Logout") &&
   (user_has_access)
  then Login Interface
else
  NO ACTION

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