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For example, with each functional area written all at once there is less need to refactor than with a process where the same code might be repeatedly changed. Not surprisingly, less refactoring is one of the benefits of traditional development methods so in some sense FDD can be argued to combine both traditional and Agile approaches.

All You Need to Know About Feature Driven Development

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All You Need to Know About Feature Driven Development - Konstantinfo

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We'll get back to you as soon as possible. Development splits each of the stories into a number of tasks. Each developer accepts responsibility for a set of tasks. Replace stories with domain walkthroughs and tasks with features and it sounds very similar to the first three activities in FDD. As developers learn of requirements they start forming mental images of the system, making assumptions and estimating on that basis. Developing an overall domain object model forces those assumptions out into the open, misunderstandings are resolved and a more complete, common understanding is formed.

XP uses the analogy of driving a car - driving requires continual little course adjustments, you cannot simply point the car in the right direction and press the accelerator. A domain object model is the map to guide the journey; it can prevent you from driving around in endless circles. The domain object model provides an overall shape to which to add function, feature by feature. The domain object model enables feature teams to produce better designs for each group of features.

This reduces the amount of times a team has to refactor their classes to add a new feature. Reducing the time spent refactoring increases the time that can be spent adding new features. XP promotes collective ownership of code; any developer can add to or alter any piece of source code as they discover the need. But collective ownership usually degenerates into non-ownership as the number of people involved grows. Small communes often work, larger communes rarely work for any length of time. XP claims three benefits from collective code ownership:.

Feature teams also solve these problems, while keeping the well established benefits of individual code ownership:. XP also assumes that short integration and testing cycles means a low rate of collisions from developers updating the same piece of source code. For larger numbers of developers and systems this is obviously less and less likely to be true.


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Design and code inspections, when done well, are proven to remove more defects than testing. XP uses pair programming to provide a continuous level of design and code inspection. All low-level design and coding is done in pairs. This is obviously better than individual developers delivering code without any form of inspection.

FDD promotes more formal inspections by feature teams; the level of formality is left to the chief programmer's discretion. This takes more time, but it has added advantages over pair-programming:. There is no reason why members of feature teams cannot pair up during coding when this is desirable. It is not unusual to see two members of a feature team working together where care is needed. One of the great things about feature teams is that a feature is complete only when the team is finished not when any one individual is finished; it is in the team members' own interests to help each other.

Correctness in XP is defined by the running of unit and functional tests. FDD does not define the mechanisms or level of formality for unit testing; it leaves that to the chief programmer to do what is appropriate. Where continuous or regular system builds are performed, it certainly makes sense to have a growing set of tests that can be run against a new build. Again FDD does not specify this because technology and resources differ so much between projects.

In some circumstances it is very difficult to produce a set of completely isolated, independent tests that run in a reasonable amount of time. XP leaves tracking to the project managers, encouraging them to minimize the overhead of collecting data and use large visible wall charts. In contrast, Tracking By Feature in FDD describes a low-overhead, highly accurate means of measuring progress and provides the data to construct a large variety of practical, useful, progress charts and graphs.

It is important to discover what works for you and your organization. The name of the process you use is not important. What is important is the ability to repeatedly deliver frequent, tangible, working results on time, within budget and with agreed function.

Feature Driven Development and Extreme Programming

Coad Letter Modeling Editor Abstract: Dear Friend, Software development process is news again. Well intentioned managers and teams get so wrapped up in executing process that they forget that they are being paid for results, not process execution" "No amount of process over-specification will make up for bad people. Build a Feature List Using the knowledge gathered during the initial modeling, the team next constructs as comprehensive list of features as they can. Plan By Feature The third activity is to sequence the feature sets or major feature sets depending on the size of the system into a high-level plan and assign them to chief programmers.

Graph and trend over time to monitor progress rates. Collective Ownership or Class Ownership XP promotes collective ownership of code; any developer can add to or alter any piece of source code as they discover the need. XP claims three benefits from collective code ownership: We avoid waiting for someone to make a change we need in their code. Overly complex code is eliminated because anyone who finds such code will try to simplify it.

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Knowing this, developers are less likely to add complexity that they cannot justify. Collective ownership spreads knowledge of a system throughout the team reducing risk if a critical team member leaves. Feature teams also solve these problems, while keeping the well established benefits of individual code ownership: By definition, all the owners of classes needing updates for the development of a particular feature are members of the feature team.

In other words, the feature team owns all the code that needs changing for a particular feature. This minimizes the waiting for someone else to modify their code. The irritating 'development by surprise' problem where a developer delivers code that is different from agreed design is caught at code inspection by the feature team and rejected. Overly complex code is caught in the same way, before it enters the system. Although class owners work only on the classes they own, owners of closely associated classes frequently work in the same feature team.

They get to know those closely associated classes. Knowledge is clustered rather than randomly scattered. Inspections and Pair Programming Design and code inspections, when done well, are proven to remove more defects than testing. This takes more time, but it has added advantages over pair-programming: