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: Software Testing Process Models Benefits&Drawbacks: a Systematic Literature Review 
Chapter Title:  TM2: 
1. Abstract of Cited Paper (BIB001):  One of the latest additions in defining the test process is the upcoming ISO/IEC 29119 standard, which aims to define a universally applicable generic test process model. However, currently the standard does not offer any support for the adoption process of the model. In this paper, we present our framework, which aims to combine a maturity level-based approach with the standard process. Our objective was to create an easy-to-use framework for organizations to assess how closely their existing test process follows the standard, and give feedback on improvement objectives. Our results indicate that combining maturity levels with the standard is a viable approach to assess the implementation of the standard in practice. 
2. Abstract of Cited Paper (BIB002):  Testing is an essential part of the software development lifecycle for gaining trust in the quality of the delivered product. Concerns have been raised over the maturity of existing test processes and techniques, and the desire to improve has been acknowledged. Even though there are test process improvement models available on the market, the guidelines on how to use them are unsatisfactory. This paper describes the empirical analysis of Test Maturity Model integration (TMMi) through a single-object case study of test process assessment and improvement planning conducted in Playtech Estonia’s Casino unit. An evaluation on the performance of TMMi is presented, raising also some concerns over its applicability in agile environments. Improvement possibilities for TMMi are described, which contribute to the potential enhancement of the framework. 
3. Abstract of Cited Paper (BIB003):  Context: Testing is one of the most important phases of software development. However, in industry this phase is usually compromised by the lack of planning and resources. Due to it, the adoption of a streamlined testing process can lead to the construction of software products with desirable quality levels. Objective: Presenting the results of a survey conducted to identify a set of key practices to support the definition of a generic, streamlined software testing process, based on the practices described in the TMMi (Test Maturity Model integration). Method: Based on the TMMi, we have performed a survey among software testing professionals who work in both academia and industry. Their responses were analyzed quantitatively and qualitatively in order to identify priority practices to build the intended generic process. Results: The analysis enabled us to identify practices that were ranked as mandatory, those that are essential and should be implemented in all cases. This set of practices (33 in total) represents only 40% of the TMMis full set of practices, which sums up to 81 items related to the steps of a testing process. Conclusion: The results show that there is a consensus on a subset of practices that can guide the definition of a lean testing process when compared to a process that includes all TMMi practices. It is expected that such a process encourages a wider adoption of testing activities within the software industry. 
4. Abstract of Cited Paper (BIB004):  The software testing phase, despite its importance, is usually compromised by the lack of planning and resources in industry. This can risk the quality of the derived products. The identification of mandatory testing-related practices may lead to the definition of feasible processes for varied sizes of software companies. In this context, this work aims at identifying a set of key practices to support the definition of a generic, streamlined software testing process, based on practices that are described in the TMMi (Test Maturity Model integration), and verify the alignment of the devised process with the TMMi levels. We have performed a survey amongst Brazilian software testing professionals who work in both academia and industry, in order to identify priority practices to build the intended, streamlined process; additionally, we applied a diagnosis tool in order to measure the level of TMMi which is fulfilled with the devised process. A set of 33 (out of 81) practices were ranked as mandatory by most of participants, which represents 40 % of the TMMi’s full set of practices; on the downside, a testing process that relies on this subset of TMMi practices does not fully fulfil level 2 (Managed) of the maturity model. The identified subset of practices can guide the definition of a lean testing process when compared to a process that includes all TMMi practices; it is expected that such a process encourages a wider adoption of testing activities in software development; even though the streamlined process does not encompass many practices that are spread across TMMi levels, a substantial subset of level 2 practices (Managed) should be accomplished with its adoption. 
5. Abstract of Cited Paper (BIB005):  Model-based testing (MBT) provides a systematic and automated way to facilitate rigorous testing of software systems. MBT has been an intense area of research and a large number of MBT techniques have been developed in the literature and in the practice. However, all of the techniques have been developed using their own concepts and terminology of MBT, which are very often different than other techniques and at times have conflicting semantics. Moreover, while working on MBT projects with our industrial partners in the last several years, we were unable to find a unified way of defining MBT techniques based on standard terminology. To precisely define MBT concepts with the aim of providing common understanding of MBT terminology across techniques, we formalize a small subset of the recently released ISO/IEC/IEEE 29119 Software Testing Standard as a conceptual model (UML class diagrams) together with OCL constraints. The conceptual model captures all the necessary concepts based on the standard terminology that are mandatory or optional in the context of MBT techniques and can be used to define new MBT tools and techniques. To validate the conceptual model, we instantiated its concepts for various MBT techniques previously developed in the context of our industrial partners. Such instantiation automatically enforces the specified OCL constraints. This type of validation provided us feedback to further refine the conceptual model. Finally, we also provide our experiences and lessons learnt for such formalization and validation.

Literature Review:
No comprehensive documentation about agile practices in comparison with CMMI and application of best practices BIB003 . TM3: No practical and realistic improvements on embedded software BIB001 . TM6: Priorities are not defined in the case of lack of time or resources BIB005 . Model complexity TM2: Very detailed practices and distribution across the specific goals and process areas make the model complex and difficult to understand BIB004 . TM8: A high level of abstraction introduces ambiguity in understanding the concepts BIB006 . Practical limitations TM2: Practical limitations in real cases, for example the implementation of the idea to move all processes to one level before proceeding to the next is not possible and the level requirements are not intuitive BIB002 . TM17: It requires continuous adaptation of the practices  . Other TM12: The organization should construct and strengthen the knowledge-oriented culture and the team enthusiasm. TM12: The organization should understand the model fully when planning and adapting the testing processes.