This rhyme suggests that a teacher can use three subjective measures (if the child 'knows' she is happy then she will tap toes, nod heads, or clap) and one objective measure ("your face will surely show it") to tell if a child is happy \cite{lyrics}. What is the basis of this understanding? Does this also work for adults and all stages of life? In the absence of empirically validated evidence, this may appear as a  crude/unreliable manner to measure a child's happiness, besides being binary (i.e., either the child is happy or not). Yet a perusal of the World Happiness Database for validated measurement indices of happiness for adults use this approach \cite{happiness}. Assessment of the world database of happiness instruments suggest that various instruments and surveys use conditional statements to individuals, and then these  instruments can be used to assess a level of happiness on the basis of the coded response the individuals provide. None of the instruments provide any objective measurement to correlate the measurement of happiness or quantify happiness, or calibrate happiness as a construct itself.