Key Factors to Consider while Evaluating the Practicality and Sustainability of Different Solutions in Case Studies:

1. Alignment with Objectives:
- The proposed solution should align with the objectives and goals of the case study. It should address the underlying problem and help achieve the desired outcome.

2. Feasibility:
- The practicality of a solution depends on its feasibility. Factors such as available resources, technology, expertise, and time constraints should be considered. It is crucial to evaluate if the solution can be implemented within the given constraints.

3. Cost-effectiveness:
- The financial implications of a solution play a vital role. It is important to assess the cost of implementation, operation, and maintenance. A sustainable solution should provide long-term benefits that outweigh the initial investment.

4. Stakeholder Engagement:
- Consideration of the perspectives, needs, and concerns of all stakeholders is essential. A solution that involves and engages stakeholders is more likely to be practical and sustainable. Their buy-in and support can contribute to successful implementation.

5. Environmental Impact:
- Assess the potential environmental impact of the proposed solution. Sustainable solutions minimize negative effects on the environment and promote conservation of resources. It is crucial to evaluate if the solution contributes to long-term environmental sustainability.

6. Social Acceptability:
- Evaluate the social implications and acceptability of the proposed solution. It should be culturally appropriate, respect local customs, and meet the needs of the community. A solution that considers social factors is more likely to be embraced by the community and have long-term viability.

7. Scalability and Replicability:
- Consider if the solution can be scaled up or replicated in other contexts. A practical and sustainable solution should have the potential for wider implementation, ensuring its impact reaches beyond the case study.

8. Monitoring and Evaluation:
- Establish mechanisms to monitor and evaluate the implementation of the solution. Regular assessment allows for adaptations and improvements, ensuring the continued practicality and sustainability of the chosen solution.

Conclusion:
Evaluating the practicality and sustainability of different solutions in case studies involves a comprehensive assessment of various factors. It requires aligning the solution with objectives, considering feasibility, cost-effectiveness, stakeholder engagement, environmental impact, social acceptability, scalability, and monitoring mechanisms. By considering these key factors, decision-makers can make informed choices that lead to practical and sustainable outcomes.