Sunday, July 19, 2009

Business Process Management (Part-1 Foundation[Chapter II Evolution of Enterprise Systems Architectures ] ) Sec J -- By Mathias Weske

Challenges for Workflow Management

As discussed in the previous sections, workflow management has considerable benefits due to explicit process representation and process enactment control. However, workflow management has also spawned criticism that has led to a broader perspective in business process modelling, organization, and control realized by business process management.

Lack of Adequate Support for Knowledge Workers

In contrast to many developments in software architecture and technology, workflow management systems have massive effects on the daily work for their users. The method of data storage and whether the program was developed with a procedural programming language or an object oriented programming language are relevant only for system designers and developers; these implementation aspects do not matter for the users of these systems. Therefore, special care has to be taken in the rollout of workflow applications; early participation of users in the design of these systems is important to avoid user acceptance issues. Workflow management systems represent not only processes but also the organizational environment in which these processes are executed. This means that persons are represented by their skills, competences, and organizational positioning. This information is used to select persons to perform certain activities. The active selection of persons by the workflow management system has not been considered appropriate, since human workers felt that a machine burdened them with additional work. This feeling might also be due to crude interfaces of early workflow management systems. The role of knowledge workers is another area where traditional workflow management systems scored low. Workflow models prescribe the process flow, and a workflow management system makes sure that the workflow is performed just as it is described. This also means that there is little room for creativity for the knowledge worker. Any process instance that has not been envisioned by the process designer cannot be realized. This might lead to situations where certain parts of the overall business process are not handled by the workflow management system. Sometimes, even paper-based solutions were used by the knowledge workers, leading to inconsistent states in the overall process.

Technical Integration Challenges

While system workflows are well equipped to support the process aspect of enterprise application integration scenarios, the same technical integration problems need to be solved in system workflow projects as those in traditional enterprise application integration projects. Application systems that need to be integrated are typically not equipped with well-documented interfaces that can be used to get hold of the required functionality. Functionality of application systems might also be implemented in the graphical user interfaces, so that low-level implementation work is required to access the application system functionality. Another important source of trouble is relationships between different applications at the code level. Direct invocation between software systems is an example of these relationships, so that an invocation of an application system automatically spawns off an invocation of another application system. In these settings, the overall process flow is in part realized at the application code level, so that the workflow management system is capable of controlling only parts of the actual process flow, but not the complete process. The granularity of the workflow activities and the granularity of the functionality provided by the underlying application systems might be different. Fine-granular business activities might have been designed in the process model that cannot be realized, because the underlying application system only provides coarse-grained functionality. In some cases, the interface to the application can be modified so that fine-grained functionality is available. This alternative is likely to incur considerable cost, or it might be impossible for some applications. Another alternative is changing the granularity of the business activities. In this case, certain properties of the process might not be realizable—for instance, the concurrent execution of two fine-granular activities. As a result, the run time of the workflow will not be optimal. Service-oriented architectures and service-enabling of legacy applications are important concepts currently being investigated to address these technical problems.

Process Support Without Workflow Systems

Not all environments ask for a workflow management system. In cases where no changes to the process structure are envisioned, a coding of the process flow can be an attractive and adequate choice. In database administration there are predefined procedures that are enacted following a process model. Similar developments can be found in publishing environments where print workflow is a common tool to describe and perform the steps that lead to publishable results. Most enterprise resource planning systems feature a dedicated workflow component that allows us to model new processes and enact them in the system environment. Due to their close link to particular applications, these systems are also called embedded
workflow management systems.
Business processes are also realized in online shops, such as train reservation
systems or electronic book stores, where steps of an interaction process
are depicted in graphical form. This graphical representation guides the user
in his interaction with the Web site. In a train reservation online shop, for
instance, there are interaction steps for querying train connections, for getting
detailed information on the connections, for selecting connections, for
providing payment information, and for booking and printing the train ticket.
Since this type of interaction process can easily be realized using traditional
Web page design, workflow management systems are not required. However,
these examples show that the business process paradigm is helpful also in
application scenarios that do not require dedicated workflow support.
Enterprise application systems, such as enterprise resource planning systems,
realize literally thousands of business processes. These processes can be
customized to fit the particular needs of the company that runs the system. In
most cases, the business processes are realized within the system, so no integration
issues emerge. If the predefined business processes cannot be tailored
in a way that fits the needs of the company, then integrated process modelling
functionality can be used to model new processes

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