Worker Iron Supplementation Evaluation Project (WISE or HATAS) is an iron supplementation intervention study conducted in Purworejo, Central Java in collaboration with the Community Health and Nutrition Laboratory University of Gajah Mada (CHNRL-UGM). The study is designed to examine potential pathways through which fundamental health improvements mayimpact overarching individual and family well-being.

Roughly 17,500 individuals living in 4,300 households were included in the study sample, divided into a treatment group (receiving iron supplements for 15 months) and a control group. Data collection commenced immediately after the screening survey. Detailed individual and household interviews were conducted, and objective health measurements (such as height, weight, and haemoglobin tests) collected at four-month intervals. Individuals and households were re-interviewed and measured every four months for a period of two years. Post-surveys were conducted from September 2006, with roughly 6,000 households re-interviewed. To date, SurveyMETER has achieved a 96% re-contact rate thanks to intensive local tracking and far-reaching tracking of movers to other regions of Central Java (such as Jakarta, Banten, and Yogyakarta). In total, the study has been conducted over 14 rounds and 8 years.

Alongside household and individual surveys, WISE has conducted an annual community facility and price survey (based upon market and community informants) every four months, thereby enriching the body of information on the effect of iron supplements on individual health and productivity.(SM)