storming to explore the requirements in greater detail. You still need to do some initial requirements modeling. Why requirements change, prioritizing requirements. It's reasonable to associate an order-of-magnitude estimate with requirements further down on the stack, so you'll need just enough information about the requirement to do exactly that. If they team is doing a great job then they may decide to increase the funding, and similarly if the team is doing a poor job then they should decrease or even cut funding. The implication is that at various points in the project that the stakeholders should be able to say "OK, this is good enough for now, let's deploy this into production giving them control over the schedule. By developing working software on a regular basis stakeholders can actually see what they're getting for their IT investment. Although there are often many project stakeholders - end users, managers, architects, operations staff, and so on - the product owner is responsible for representing them all.
The approach I'm describing enables the latter, and according to the 2007 Project Success survey, that's what the vast majority of people desire. There are several reasons why this is incredibly attractive for stakeholders: They get concrete feedback on a regular basis. The development team is always working on the highest priority requirements which are currently identified, and they produce working software each iteration.
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Potential Challenges With This Approach Traditionalists often struggle with the how to cite a newspaper article in essay following issues: It isn't clear how much the system will cost up front. User stories are a little larger but still relatively easy to estimate. This enables them to maximize stakeholder ROI. This happens because: They missed a requirement. Scrum suggests that you freeze the requirements for the current iteration to provide a level of stability for the developers. If the team has been doing a good job then the stakeholders are likely to continue the same level of funding. The requirements in the current iteration must be understood in detail.
A stakeholder will be working with an existing system and realize that it's missing a feature. As the requirements change the cost must also change. This model effort should still be agile, it's surprising how quickly you can sketch a few whiteboard diagrams which captures a viable architectural strategy for your team. You need to do just barely enough for your situation. Why Requirements Change People change their minds for many reasons, and do so on a regular basis. They have control over the budget. The stakeholders can fund the project for as long as they need. Process, because requirements change frequently you need a streamlined, flexible approach to requirements change management.