Software development models evolve over the years where new tries to improve on the shortcoming of the subsequent model. Others emerge because of the need for a new way of thinking and development.

Different models put emphasis on specific phase of development than the other.

Make value judgement of at least $3$ development model$/$methodology that can be most effective during COVID$-19$ lockdown. In you value judgement put emphasis on the following:

$$Identifying the challenges inherent in each phase of the software life cycle or development process: requirements, specification, analysis, design, implementation, testing, and maintenance.

$$How to address the challenges inherent in the software life cycle, evaluate well$-$known tools and techniques and best practices and examine the solutions available $($from different sources$).$