How can you evaluate quality attributes and trade-offs for decentralized solutions?

1 Define quality attributes

The first step is to define the quality attributes that are relevant and important for your system. Quality attributes are the non-functional requirements that describe how well the system performs its functions, such as response time, availability, or user satisfaction. You can use a standard framework, such as ISO/IEC 25010, or customize your own criteria based on your stakeholders' needs and expectations. You should also prioritize the quality attributes based on their importance and impact on the system's value proposition.

2 Identify trade-offs

The next step is to identify the trade-offs that arise from the design decisions and constraints of the decentralized solution. Trade-offs are the compromises that you have to make between different quality attributes, such as sacrificing performance for security, or usability for scalability. You can use a trade-off analysis matrix, such as ATAM, to systematically evaluate the trade-offs and their implications. You should also consider the trade-offs between the decentralized and centralized aspects of the system, such as data consistency, governance, or interoperability.

3 Measure quality attributes

The third step is to measure the quality attributes and trade-offs using quantitative and qualitative methods. Quantitative methods involve collecting and analyzing data from the system, such as metrics, benchmarks, or tests. Qualitative methods involve gathering and interpreting feedback from the users, such as surveys, interviews, or reviews. You should use a combination of both methods to get a comprehensive and accurate picture of the system's quality. You should also use appropriate tools and frameworks, such as DASH, to facilitate the measurement process.

4 Compare alternatives

The fourth step is to compare different alternatives for the decentralized solution based on the quality attributes and trade-offs. Alternatives are the different options or variations that you can choose for the system's architecture, design, or implementation, such as protocols, platforms, or technologies. You can use a comparison matrix, such as QAW, to systematically compare the alternatives and their advantages and disadvantages. You should also use criteria, such as cost, feasibility, or compatibility, to rank and select the best alternative for your system.

5 Monitor and improve

The final step is to monitor and improve the quality attributes and trade-offs of the decentralized solution over time. Monitoring involves observing and reporting the system's behavior and performance, such as through dashboards, alerts, or logs. Improving involves adjusting and optimizing the system's configuration and parameters, such as through tuning, updating, or patching. You should use a feedback loop, such as PDCA, to continuously monitor and improve the system's quality. You should also use best practices, such as DevOps, to ensure the system's quality throughout its lifecycle.

6 Here’s what else to consider

This is a space to share examples, stories, or insights that don’t fit into any of the previous sections. What else would you like to add?