Air Conditioning and Refrigeration CHRONOLOGY

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2. Semantic Changes. To reason about a system, we need to raise the level of abstraction beyond mere syntactic changes. This is achieved by the composition mechanism. A sequence of lower-level changes can be composed to form a single, higher level change encapsulating a semantic meaning. Here are a few examples: – A sequence of consecutive changes involving a single method m can be interpreted as a single method implementation, or modification if m already existed. – Changes to the structure of a class c (attributes, superclass, name) are either a class definition or a class redefinition, if c existed before the changes.

More details on the other projects are available in the extended version of [11]. 34 R. Robbes, M. Lanza, and M. 1 Detailing the Evolution of a Student Project We chose project I for a detailed study, because it had the most classes in it, and was the second largest in statements. Project I is a role-playing game in which a player has to choose a character, explore a dungeon and fight the creatures he finds in it. In this process, he can find items to improve his capabilities, as well as gaining experience.

We can already see some interesting trends: Some projects have a lot more “backtracking” (removals of entities) than others; usage of actions related to refactoring (commenting, renaming, repackaging entities) varies widely between projects. In the remainder of the section, we concentrate on the analysis of one of the projects, namely the role-playing game project I (the last column of the table). More details on the other projects are available in the extended version of [11]. 34 R. Robbes, M.

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