In reality, many of the stakeholders' decisions about their desirable requirements can be dependent on other internal or external factors. Such dependencies entail conditionality between the requirements that have been defined, e.g., a requirement is desirable for the stakeholders only if a certain condition is met or some other requirements are excluded.… (More)
—Business process families provide an over-arching representation of the possible business processes of a target domain. They are defined by capturing the similarities and differences among the possible business processes of the target domain. To realize a business process family into a concrete business process model, the variability points of the business… (More)
This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may… (More)
Quintessence is based on the five elements that, according to the alchemists, make up the world: fire, water, earth, air, and the mythical substance aether. Aristotle included it as a fifth element distinct from the other four. It is believed to be the substance that fills the region of the universe above the terrestrial sphere and forms the heavenly bodies.