1. Physical
   1. Research
      1. Develop engineering standards
      2. Increase utilizable water resources
   2. Rainwater quality
   3. Rainwater availability
   4. Easy maintenance
   5. Easy to construct
2. Social
   1. Gender Equity
   2. Promotion for users
      1. About financial possibilities
      2. About avoiding health risks
      3. Education & training programs
      4. From 'last choice' to 'equal alternative'
   3. People's participation
      1. (Financial) commitment
      2. Management responsibility
      3. Education & training programs
      4. Co-funding by users
3. Financial
   1. Incentives
      1. Tax rebate
      2. Subsidy
      3. Loan
   2. Co-funding by users
4. Institutional
   1. Favourable policy framework
   2. Obligations
   3. From 'last choice' to 'equal alternative'