Quantum computing has immense computational advantages. It escorts today's world of computing towards qubits universe of computing by the logical superposition technique. Various new technologies will come to reality with replacement of existing problem-solving methodology. The development of quantum computing imposes significant impact on cyber security and digital forensics technologies. Cybercrimes may be dramatically increased and malicious code will get ability to harm speedily. The quantum computing in software forensics methodology needs to develop in order to counter the challenges such as traceability of malicious code automation, sources of malicious code generation, intellectual property right theft issues, source code validation, plagiarism, breach of copyright issues, and an acquisition of digital evidence with quality and quantity with the wings of quantum forensics. This chapter aims to concentrate on the key issues of quantum computing approach in the field of software forensics with ontological aspects.

Maintainability is an essential software quality factor that is useless if it is not available at an initial stage in the software development life cycle. It becomes more important in the case of object oriented design. Estimating maintainability of object oriented design near the beginning in the development cycle, mainly at design phase; significantly reduce the development cost and rework, and as well as assists the software designers and developers for delivering high quality maintainable software within time and budget. This paper illustrates the need and significance of maintainability at design phase and build up a multivariate linear Maintainability Estimation Model for Object-Oriented Design. Developed model estimates the maintainability of class diagrams in respect of their Extendibility, Reusability. Lastly the developed models have been validated using experimental tryout.

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