Hi Guys,

Here's some feedback/answers related to your questions and Level 1 diagrams (not necessarily in same order):

• Yes - requirements elicitation is an ongoing process! There is no such thing as perfect process, model, system, etc.  The more you are familiar with a system and the given business domain the more you will uncover new requirements and areas which should be refined.  Requirements gathering is an iterative process.  This is why prioritization should be a key concept for every business analyst.  The BA should prioritize at every step in the process; for example at the problem statement state consider which are the most pressing business needs, at vision level consider which features are most important, at the requirements level identify the high priority requirements, at the data flow modeling level identify the key processes.  So at every step work first on the most important things first and then move to the next step of the process (you can refine later) or else you'll never go anywhere.
• Sonavi: related to the item above - in the Level 1 diagram you need to show the key processes (Withdraw Cash, Deposit Money, etc.) your diagram has none of those.  Things like "Display Error Message" are too detailed at this level and not very important at this time.  Same goes for: "Display Options", "Exit Session", "Send for data input and outputs
• Data flows from Entities must flow into Processes
• Data flows to Entities must come from Processes
• Processes and Data Stores must have both inputs and outputs; what goes in must come out!
• Inputs to Data Stores only come from Processes
• Outputs from Data Stores only go to Processes

- Adrian

Hi Tony,

I would argue that it is up to the Business Analyst to ensure that they have all they need in order to start with a top-down approach.  Every project should have some sort of charter and problem statement or list of needed features.  I realize that the business analysis process is an iterative one and that not all info gets discovered upfront.  As new info is discovered the models should be updated.

- Adrian

Im really struggling with these Dataflow Diagrams.

Iva attached my level 0 and 1. Level 1 is incomplete as I got so muddled!

Ive kind of got muddled with what i do and dont need.

How in depth do you go, that kind of thing?

Ive moved onto Use cases till Someone can tell me to Bin my WFD!!!!!

Ok scrap that work firewall wont allow me to upload docs? Can I email them to somebody (and thus lkeep them private! LOL ;0) _