PSSUQ (Submit Research System Usability Questionnaire) is a post-task measurement instrument which is used to evaluate system’s usability. Present, third model has 16 statements. Every assertion has a likert scale from 1 (strongly agree) to 7 (strongly disagree). Every assertion additionally has NA (not relevant) possibility.
PSSUQ has an general rating which is calculated by averaging the scores given to statements.
Person strongly agrees on each assertion, PSSUQ general rating is due to this fact 1.
PSSUQ additionally has sub-scales for system usefulness (SysUse), info high quality (InfoQual) and interface high quality (IntQual). Their scores are calculated as:
- SysUse: averaging scores of statements 1 to six
- InfoQual: averaging scores of statements 7 to 12
- IntQual: averaging scores of statements 13 to 15.
However how ought to I deal with statements that consumer thinks aren’t relevant? Do they get the worth Zero or do I simply ignore them from the calculation? For instance in IntQual which has solely three statements if NA will get the worth 0:
Person strongly agrees on two statements and one assertion doesn’t apply, IntQual rating is 0,667.
If NA is discarded:
Person strongly agrees on two statements and one assertion doesn’t apply, IntQual rating is 1.