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the next Other examples of work ows include processing of expense vouchers, of purchase orders, and of credit-card transactions Today, all the information related to a work ow is more than likely to be stored in a digital form on one or more computers, and, with the growth of networking, information can be easily transferred from one computer to another Hence, it is feasible for organizations to automate their work ows For example, to automate the tasks involved in loan processing, we can store the loan application and associated information in a database The work ow itself then involves handing of responsibility from one human to the next, and possibly even to programs that can automatically fetch the required information Humans can coordinate their activities by means such as electronic mail We have to address two activities, in general, to automate a work ow The rst is work ow speci cation: detailing the tasks that must be carried out and de ning the execution requirements The second problem is work ow execution, which we must do while providing the safeguards of traditional database systems related to computation correctness and data integrity and durability For example, it is not acceptable for a loan application or a voucher to be lost, or to be processed more than once, because of a system crash The idea behind transactional work ows is to use and extend the concepts of transactions to the context of work ows Both activities are complicated by the fact that many organizations use several independently managed information-processing systems that, in most cases, were developed separately to automate different functions Work ow activities may require interactions among several such systems, each performing a task, as well as interactions with humans A number of work ow systems have been developed in recent years Here, we study properties of work ow systems at a relatively abstract level, without going into the details of any particular system.

AAA helps you centralize your security checks and is broken into three areas: authentication (who), authorization (what), and accounting (when) Together, all three of these areas are referred to as AAA Authentication is responsible for checking a user s identity to determine if she is allowed access to a networking device A user must enter a username and password to validate Once she has gained access to the networking device, authorization determines what the user can do what commands she can execute and what privilege levels she has access to For example, you could allow a person Privilege EXEC access to a router, but not allow her access to Configuration mode And last, you can keep a record of a user s actions, like what commands she executed and when she executed them, with the accounting function

Internal aspects of a task do not need to be modeled for the purpose of speci cation and management of a work ow In an abstract view of a task, a task may use parameters stored in its input variables, may retrieve and update data in the local system, may store its results in its output variables, and may be queried about its execution state At any time during the execution, the work ow state consists of the collection of states of the work ow s constituent tasks, and the states (values) of all variables in the work ow speci cation The coordination of tasks can be speci ed either statically or dynamically A static speci cation de nes the tasks and dependencies among them before the execution of the work ow begins For instance, the tasks in an expense-voucher work ow may consist of the approvals of the voucher by a secretary, a manager, and an accountant, in that order, and nally by the delivery of a check The dependencies among the tasks may be simple each task has to be completed before the next begins A generalization of this strategy is to have a precondition for execution of each task in the work ow, so that all possible tasks in a work ow and their dependencies are known in advance, but only those tasks whose preconditions are satis ed

As an example, I worked with a company that had about 1,200 routers This company had a dozen networking administrators, as well as many networking contractors working for them; on average, they had about 50 to 60 contractors working there each week

The McGraw Hill Companies, 2001

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Grandfathering: If the new pay program calls for reducing pay levels, another approach is to grandfather highly paid participants without reducing target pay levels for either base salary or incentive pay

are executed The preconditions can be de ned through dependencies such as the following: Execution states of other tasks for example, task ti cannot start until task tj has ended, or task ti must abort if task tj has committed Output values of other tasks for example, task ti can start if task tj returns a value greater than 25, or the manager-approval task can start if the secretary-approval task returns a value of OK External variables modi ed by external events for example, task ti cannot be started before 9 AM, or task ti must be started within 24 hours of the completion of task tj We can combine the dependencies by the regular logical connectors (or, and, not) to form complex scheduling preconditions An example of dynamic scheduling of tasks is an electronic-mail routing system The next task to be scheduled for a given mail message depends on what the destination address of the message is, and on which intermediate routers are functioning

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