You are presented with multiple paper abstracts, alongside the associated literature review and chapter titles. Given the provided information, you are going to do a literature review. Please generate a coherent literature review that synthesizes the content, draws connections between different works, highlights major findings, and identifies any gaps in the existing research.

Literature Review Title: Summary of a Literature Review in Scalability of QoS-aware Service Composition 
Chapter Title:  A. RESEARCH QUESTIONS 
1. Abstract of Cited Paper (BIB001):  Service-oriented system engineering (SOSE) has drawn increasing attention since service-oriented computing was introduced in the beginning of this decade. A large number of SOSE challenges that call for special software engineering efforts have been proposed in the research community. Our goal is to gain insight into the current status of SOSE research issues as published to date. To this end, we conducted a systematic literature review exploring SOSE challenges that have been claimed between January 2000 and July 2008. This paper presents the results of the systematic review as well as the empirical research method we followed. In this review, of the 729 publications that have been examined, 51 were selected as primary studies, from which more than 400 SOSE challenges were elicited. By applying qualitative data analysis methods to the extracted data from the review, we proved our hypotheses about the classification scheme. We are able to conclude that the SOSE challenges can be classified along two dimensions: (a) based on themes (or topics) that they cover and (b) based on characteristics (or types) that they reveal. By analyzing the distribution of the SOSE challenges on the topics and types in the years 2000–2008, we are able to point out the trend in SOSE research activities. The findings of this review further provide empirical evidence for establishing future SOSE research agendas.

Literature Review:
Our study intended to answer the following questions: [RQ1:] How are authors on QoS-based dynamic service composition evaluating the scalability of their solutions? [RQ2:] What are the scaling dimensions (and their value ranges) being considered by researchers in this area to characterize the scalability of their solutions? [RQ3:] What are the metrics being considered by researchers to characterize the scalability of their solutions? B. DATA SOURCES AND SEARCH STRATEGY In software engineering, electronic databases are normally considered sufficient BIB001 BIB002 . Hence, we used the following search engines: IEEE Explore, ACM Digital Library, Science Direct, Engineering Village (which searches INSPEC as well as EI Compendex), ISI Web of Knowledge, Google Scholar, and CiteSeer. We searched all the data sources, using a combination of the following keywords (and variations): quality of service (QoS, QoS-aware, QoSenabled), web service composition (WSC, Service Composition, Service-based, Service-Oriented, Servicebased Architecture, Service oriented Architecture, Serviceselection) and dynamic (Adaptive, Adaptation, Self-adaptive, Self-optimizing, Self-healing, Self-managing). The search strings formed by these keywords were adapted for each search engine.