1) Define what “effectively used” means - as a minimum, it should mean that the cash/ materials (either all or a very high %) was used for (re)constructing the shelter. However, you might also want to add further requirements, such as (re)constructing the shelter according to certain quality standards, ensuring minimum covered floor areas, etc.
2) Assess how many households (and people) used the provided cash and/ or materials “effectively”:
i) interview a representative sample of the beneficiaries about the extent to which they used the provided cash/ materials for the given purpose (Q1: How much of the provided cash/ materials did you already use? Q2: How much of the cash/ materials did you use for shelter (re)construction?); enquire also about your additional requirements
ii) select randomly a sample of the targeted shelters and visit them to observe whether the cash/ materials were used as intended + whether your additional requirements were met