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Data Architecture
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The data architecture models the information related to the solution being managed It should describe how the information is distributed across the enterprise, which data entities are involved in the solution, any data conversion considerations, and the data infrastructure Figure 10-11 shows a view of how data elements can be represented The physical data architecture is entirely dependent on the technology tools selected for the solution It is created to optimize the performance and efficiency of the solution Consequently, optimizing an Oracle database is very different from optimizing a DB2 database in terms of the use of indexes, constraints, rules, disk partitions, and other database objects Identifying this type of information before the tools are finalized will require you to rework the architecture The logical data architecture is often created significantly in advance of the physical data architecture in order to avoid duplicating effort
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The data architecture should also identify data warehouses, data marts, replication tools, and flat files in fact, any object that contains information
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Business rules are the key to any solution In an IT environment where user interfaces and big applications (like CRM and ERP) are resold to many organizations, business rules become the point of competitive differentiation One of the benefits of the Internet and n-tier architecture, and wireless computing, is to wrap business rules into a single layer that can be ported to any other architecture without rewriting the entire application The logical format of business rules can be captured in a variety of formats It is common to use a combination of modeling techniques (such as use cases) and structured English to represent all the business rules for an application
Storyboards, Mock-Ups, and Scenarios
You can use storyboards, mock-ups, and scenarios to demonstrate how an application or solution will work without actually constructing it These are useful for presentations because clients can be walked through a storyboard, for example, to see how an application will work before all the time and money is invested As for user interfaces, they traditionally consisted of screens and reports that needed to be user friendly This meant that the interfaces were readable and memorable Users were willing to memorize specific sequences of alphanumeric codes and menu structures to use applications The graphical user interface (GUI) changed user expectations dramatically They are less willing to memorize sequences of codes or navigation They demand intuitive interfaces that allow them to use educated guesses to learn the application But they are typically still willing to go through some level of training Web sites have gone even further in the demand for intuition Since anyone can be an application user, the interface has become a true art form Mock-ups are consequently very detailed views of web sites and other information a user will see that clients accept or modify before the application is built Tools like Flash, Photoshop, and XML can be used to add sizzle to the mock-ups
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Models and Flows
Many types of models and flows can be used to capture the essence of the business requirements and represent how the different pieces of a solution will work together Each of these can also be represented in an as is version and a to be version Most of them can also support logical and physical views The models and flows that will ultimately be used to define or validate the functional and technical specifications of the solution are designed in this phase While the specific techniques and formats are outside the scope of this book, here are some of the tools that must be used to design the solution: Data model These have been around for decades While there are several data modeling approaches namely, hierarchical, network, and relational the last one has become a de facto industry standard The entities identified in the data architecture are used to represent information at a low level field by field and element by element These often begin with a more detailed Entity-Relationship (ER) diagram Process model/process flow Process flows are used to represent movement in a solution For example, if the proposed solution needs to support a credit application group, a high-level process flow can be assembled to capture the major steps, as shown in Figure 10-12
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