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As reflected in the framework, the WSP stage indicators are: (1) Preparation; (2) System Assessment; (3) Operational Monitoring; (4) Management and Communication; and (5) Feedback and Improvement (Figure 1). The WSP step indicators include: (1) Assemble the WSP team; (2) Describe the water supply system; (3) Identify the hazardous events and assess the risk; (4) Determine and validate control measures, reassess and prioritize risks; (5) Develop, implement and maintain an improvement/upgrade plan; (6) Define monitoring of the control measures; (7) Verify the effectiveness of the WSP; (8) Prepare management procedures; (9) Develop supporting programs; (10) Plan and carry out a periodic review of the WSP; and (11) Revise the WSP following an incident. Twenty-eight output indicators (Table 1) were identified as the required observable results of each WSP step. These indicators were derived from the WSP Quality Assurance tool (WHO 2012), WSP Manual (WHO 2009), and WSP Manual for Distribution Systems (WHO 2014) using the criteria of Davison et al. (2005) and WHO (2011).

Table 1

WSP output indicators and maximum possible scoresa per output and per WSP stage

StageStepOutput indicatorMaximum possible score per output indicatorTotal score per stage
1. Management support  
2. WSP team  
3. Stakeholders  
   15 
4. Users and uses  
5. Drinking water quality standards  
6. Schematic/flow diagrams  
7. System description  
8. Risk assessment methodology  
9. Hazardous events  
10. Raw risks  
11. Control measures  
12. Residual risks  
13. Significant risks  
14. Improvement plan link to risks  
15. Improvement plan details  
   60 
16. Operational monitoring plan  
17. Corrective action  
18. Compliance monitoring plan  
19. Internal auditing plan  
20. External auditing plan  
21. Consumer satisfaction monitoring plan  
   30 
22. SOPs – Normal  
23. SOPs – Incident  
24. SOPs – Emergency  
25. Supporting program description  
26. Supporting program plan  
   25 
10 27. Periodic review plan  
11 28. Revision plan  
   10 
Total   140 140 
StageStepOutput indicatorMaximum possible score per output indicatorTotal score per stage
1. Management support  
2. WSP team  
3. Stakeholders  
   15 
4. Users and uses  
5. Drinking water quality standards  
6. Schematic/flow diagrams  
7. System description  
8. Risk assessment methodology  
9. Hazardous events  
10. Raw risks  
11. Control measures  
12. Residual risks  
13. Significant risks  
14. Improvement plan link to risks  
15. Improvement plan details  
   60 
16. Operational monitoring plan  
17. Corrective action  
18. Compliance monitoring plan  
19. Internal auditing plan  
20. External auditing plan  
21. Consumer satisfaction monitoring plan  
   30 
22. SOPs – Normal  
23. SOPs – Incident  
24. SOPs – Emergency  
25. Supporting program description  
26. Supporting program plan  
   25 
10 27. Periodic review plan  
11 28. Revision plan  
   10 
Total   140 140 

aMaximum possible score of 5 is used per output indicator to determine the maximum possible total score per stage to be used as denominator in the WSP Index formula.

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