Figure 1

Picture-based response sets: water glasses, abacus, and dhoko-basket scales. Children in focus groups reviewed these three drawing series to determine appropriate pictorial response sets to maintain technical equivalence. The water glasses and abacus scales were generally understood. The dhoko-basket scale was not used because children consistently identified option '0' (empty basket) as 'sad' or 'lazy' because the boy had no bricks in his basket and would therefore earn no money compared with '4' (full basket), which was associated with happiness because of high earning potential with a large number of bricks.