By Marc Hamilton

Eighty% of software program tasks fail-here's why the opposite 20% succeed!Software improvement is the main thorough, practical consultant to "what works" in software program development-and the way to make it take place on your association. major advisor Marc Hamilton tackles all 3 key elements of winning improvement: humans, tactics, and technology.From streamlining infrastructures to retraining programmers, picking out instruments to imposing service-level agreements, Hamilton unifies all of latest top practices-in administration, structure, and software program engineering. there is by no means been a extra finished blueprint for software program luck. * realize "The Ten Commandments of software program improvement" * construct a successful software program improvement crew, arrange it for achievement - and maintain your top expertise * Create a software program structure that maps to company objectives and serves as a starting place for profitable improvement * outline approaches that streamline part and Web-based improvement initiatives * Leverage some great benefits of object-oriented concepts through the complete lifecycle * utilize Java, JavaBeans, and Jini know-how * examine the simplest how you can degree software program caliber and productivity-and enhance them"

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Tier 3 would be a web server providing product information such as pricing and availability. Tier 4 would be a point-of-sale device for recording the transaction. Tier 5 would be a Java smartcard used to identify the purchaser and perhaps also carry electronic cash. The promise of cross-platform languages such as Java is that they can run on all tiers of a multi-tier architecture. This makes it simple to move functionality from one tier to another as may become necessary for performance or other reasons.

One of the biggest users of RDBMS products are the so-called packaged software vendors such as SAP, PeopleSoft, and Baan. Some database companies such as Oracle actually have their own packaged applications for financial, manufacturing, and other domains. Ten years ago, eighty percent of Fortune 500 companies used some sort of in-house developed financial or manufacturing software. Today, over eighty percent of the same companies are implementing packaged software solutions. Perhaps only the use of "Webtop Computing" with its potential for platform independence has been a faster growing trend.

Three-Tier Software Architecture If a three-tier software architecture is good, then is a multi-tier (more than three tiers) one better? As useful computing power is available on smaller and smaller devices and as cross-platform interoperability becomes easier, architectures such as the multi-tier shopping example shown in Figure 3-5 will become more common. The top tier is still the database or data storage tier. Business logic is also separated onto a second tier, as in the three-tier example.

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