It consists of two parts, including eleven questions
answered on a six-point Likert scale. Part one determines patients'
general expectations of a food container; in part two, patients rate
their general satisfaction with the test product and satisfaction with
individual product characteristics. The results give a satisfaction
index between 0% and 100%. Higher values represent greater
satisfaction. Subjective difficulties perceived during the opening
process, such as the force required, tear tab size and palpability,
were also recorded and graded on a scale of one (worst) to six (best
value).