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Model-based development is becoming an increasingly common development methodology. In important domains like embedded systems already major parts of the code are generated from models specified with domain-specific modelling languages. Hence, such models are nowadays an integral part of the software development and maintenance process and therefore have a(More)
Code cloning is not only assumed to inflate maintenance costs but also considered defect-prone as inconsistent changes to code duplicates can lead to unexpected behavior. Consequently, the identification of duplicated code, clone detection, has been a very active area of research in recent years. Up to now, however, no substantial investigation of the(More)
The area of clone detection has considerably evolved over the last decade, leading to approaches with better results, but at the same time using more elaborate algorithms and tool chains. In our opinion a level has been reached, where the initial investment required to setup a clone detection tool chain and the code infrastructure required for experimenting(More)
Due to their pivotal role in software engineering, considerable effort is spent on the quality assurance of software requirements specifications. As they are mainly described in natural language, relatively few means of automated quality assessment exist. However, we found that <i>clone detection</i>, a technique widely applied to source code, is promising(More)
Cloned code is considered harmful for two reasons: (1) multiple, possibly unnecessary, duplicates of code increase maintenance costs and, (2) inconsistent changes to cloned code can create faults and, hence, lead to incorrect program behavior. Likewise, duplicated parts of models are problematic in model-based development. Recently, we and other authors(More)
Although numerous different clone detection approaches have been proposed to date, not a single one is both incremental and scalable to very large code bases. They thus cannot provide real-time cloning information for clone management of very large systems. We present a novel, index-based clone detection algorithm for type 1 and 2 clones that is both(More)
Over time, software systems suffer gradual quality decay and therefore costs can rise if organizations fail to take proactive countermeasures. Quality control is the first step to avoiding this cost trap. Continuous quality assessments help users identify quality problems early, when their removal is still inexpensive; they also aid decision making by(More)
The architecture of software systems is known to decay if no counter-measures are taken. In order to prevent this architectural erosion, the conformance of the actual system architecture to its intended architecture needs to be assessed and controlled; ideally in a continuous manner. To support this, we present the architecture conformance assessment(More)