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data flow diagram

Data Flow Diagram (DFD) Tutorial: Texas Hold ‘Em

The data flow diagram is a useful, low-level data model that can show how data is transformed and manipulated through processes. This model does NOT show decisions, nor does it show a sequence of processes. This tutorial will take a commonly understood real-world scenario, a round of Texas Hold ‘Em, …

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HealthCare.gov and the Case of the Missing Interface Requirements

Interface requirements have taken centre-stage with the launch of the federal government’s online marketplace for insurance: Healthcare.gov. As eager enrollees rushed to access the new website, they saw first-hand what happens when a system developed by more than 50 different contractors lacks detailed definition of the data passing between systems. …

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Odd Couples

Some software requirements models just seem to be made for each other, like peanut butter and jelly. Every model has its own merits, but sometimes using them in combination during elicitation and review can break through a project logjam and open pathways for discussion and discovery. On a recent project, …

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Don’t Use Models

Number 3 in the series, “How to Shoot Yourself in the Foot: 7 ways to do software requirements poorly to set your project up for failure and what to do instead.” Short-change Time Spent on Software Requirements or Don’t do Them at All Don’t Listen to Your Customer’s Needs Don’t …

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