A collaborative, multi-stakeholder requirements development framework for in-situ chlorine and microbial monitoring sensors in low-resource settings — structured around NASA Systems Engineering lifecycle best practices.
Requirements are developed collaboratively across four domain expert working groups (IPTs), following NASA's Integrated Product Team model. Each group owns specific requirement categories and must approve before baselining.
Owns all performance, detection, and measurement specifications. Responsible for lab validation protocols and signal processing requirements.
Ensures alignment with WHO guidelines, ISO/IEC standards, UNICEF TPP requirements, and national regulatory frameworks across target deployment countries.
Represents WASH practitioners and field implementers. Owns operational, maintenance, power, and environmental requirements based on real-world deployment contexts in LMICs.
Ensures requirements reflect the needs, literacy levels, and operational capacity of community operators and local decision-makers in target settings.
Each requirement progresses through a 7-stage maturity gate from initial elicitation through field validation. Working group members can update status, add traceability notes, and log comments.
| ID | Category | Requirement | Priority | WG Owner | Source | Maturity Gate | Discussion |
|---|
Each requirement is traced to its authoritative source and linked to a specific verification method — a core NASA SE practice ensuring every requirement has a "why" and a "how to prove it."
| Req ID | Requirement (summary) | Source Authority | Verification Method | Acceptance Criteria |
|---|
Structured review events gate progression through development phases. Each review must confirm entry criteria are met and exit criteria are achieved before proceeding. Click a gate to expand.
Demonstrates how sensor-based monitoring and operational efficiency reduce cost per safe liter delivered over a 10-year horizon.
| Metric | Program A · Baseline | Program A · Enhanced | Program B · Baseline | Program B · Enhanced |
|---|---|---|---|---|
| Capital Expenses | $1,000,000 | $1,000,000 | $1,000,000 | $1,000,000 |
| Annual Operating Expenses | $100,000 | $100,000 | $100,000 | $100,000 |
| Annual Monitoring Costs | $50,000 | $100,000 | $50,000 | $1,000,000 |
| Average Uptime | 50% | 90% | 1% | 99% |
| Microbial Pass Rate | 50% | 90% | 1% | 99% |
| 10-Year Operating Cost | $2,500,000 | $3,000,000 | $2,500,000 | $12,000,000 |
| 10-Year Safe Liters Delivered | 9,125,000 | 29,565,000 | 3,650 | 35,773,650 |
| Cost per Safe Liter | $0.27 | $0.10 | $684.93 | $0.34 |
| Cost Reduction | — | 63% | — | ~100% |