Click to learn more about author Daniele Gianni. Concerns on the collection, use, and dissemination of data are central to many enterprises that directly deal with customer data to provide information services. These concerns originated from an increasing awareness of the value of privacy as well as recent government regulations, not only aiming to protect […]
Knowledge Maps – Structure Versus Meaning
Click to learn more about author John Singer. We are at an inflection point in the process of designing and building computerized systems. Let’s be honest – even with the explosion of new data technologies we are still building the same unit record processing systems from the 60’s, although with a bit more sophistication than an […]
Beware of Symmetric Relationships
Click to learn more about author Michael Blaha. A symmetric relationship is a self-relationship with the same multiplicity and role name on each end. Symmetric relationships are acceptable for conceptual models. But they are problematic for logical and physical models – you should rework the model to eliminate them. An Example For an example, consider […]