أنشئ حسابًا أو سجّل الدخول للانضمام إلى مجتمعك المهني.
The benefits derived from information should exceed the cost of providing it. The evaluation of benefits and costs is substantially a judgemental process. Furthermore, the costs are not necessarily borne by those users who enjoy the benefits, and often the benefits of the information are enjoyed by a broad range of external users.
