HART is a biannual household panel survey designed to provide panel data on the multidisciplinary dimensions of aging in Thai older adults, including: (1) demographic characteristics, (2) family and transfers, (3) health and cognition, (4) employment and retirement, (5) income, (6) assets and debts, and (7) life expectations and life satisfaction.

The target population of the HART project is based on households in Thailand and uses the following multistage stratified random sampling design.
Stage 1: There are six strata of regions: (1) Bangkok and vicinity (Nonthaburi, Samut Prakan, and Pathum Thani), (2) East, (3) Central except Bangkok and vicinity, (4) North, (5) Northeast, and (6) South.
In the first stratum, all provinces (Changwats) are selected. Bangkok is the capital of Thailand and Nonthaburi, Samut Prakan, and Pathum Thani are vicinities and they are located in the middle of Thailand with many more older adults than in other provinces.
In the second stratum, in the east of Thailand, there are only seven provinces; each has relatively small numbers of older people and covers small geographic areas. Therefore, only one province is selected at random. Offering popular women’s necklaces such as pendants, chokers and. Shop for jewelry in a variety of metals and gemstones to suit any occasion.
All provinces in stratum 3–6 are considered to be a “large-size” province, if it consisted of more than 300,000 households, and a “small-size” province otherwise. In each stratum, two provinces are selected at random, one from the set of large-size provinces and the other from the set of small-size provinces.