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Software Product Lines (SPLs) are commonly adopted with an extractive approach, by performing a reengineering process in legacy systems, when dealing with variability and reuse became challenging. As a starting activity of the process, the legacy systems are analyzed to retrieve, categorize, and group their features in terms of commonality and variability. Due to the importance of this feature retrieving, we proposed the Prepare, Assemble, and Execute framework for SPL reengineering (PAxSPL). PAxSPL aims at guiding users to customize the feature retrieval for their scenario. In an initial evaluation of the PAxSPL in a real-world scenario, we could observe the need for including scoping activities and implementing a tool to make the framework more adoptable in practice. In this paper, we describe how we performed these improvements. We performed the evolution of PAxSPL by including SPL scoping concepts and activities into our framework as well as developing a supporting tool. We also conducted a pilot study to evaluate how PAxSPL allows instantiating a scenario where the SPL reengineering were conducted. The results show that all artifacts, activities, and techniques from the scenario could be properly represented. However, we also identified a potential limitation during the assembly of techniques regarding parallel activities. The main contribution is PAxSPL_v2 that makes the framework more adherent to industries performing the reengineering of legacy systems into SPLs. CCS CONCEPTS • Software and its engineering → Software product lines.

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This report documents a broad program of basic and applied information processing research conducted by Carnegie Mellon's School of Computer Science. The Information Processing Technology Office of the Advanced Research Projects Ageny (ARPA) supported this work during the period 1 August 1990 through 2 August 1993. Chapters 1 through 6 present in detail our six major research areas: Image Understanding, VLSI, Object Management, Integrated Architectures for Intelligent Systems, Creating Graphical Applications, and Types in Programming. Each chapter briefly describes the significant results of one research area and provides references for more detailed descriptions in the published literature.