Worked example 1
An HR team surveys staff with one question: 'Overall, how satisfied are you?' (1–7). Scores look healthy, but turnover is high. They rerun using the JDI facet scales. Explain why results differ and evaluate the methods.
Show solution outline
Global measure problem: Single item masks facet patterns — staff may rate 5/7 overall because co-workers are friendly while pay and promotion facets score poorly (facet model, 4.5.1).
JDI advantage: Separate pay, promotion, supervision, work, co-workers scores reveal promotion stagnation and supervision issues driving turnover (4.5.3) despite moderate global satisfaction.
Validity concerns: Even JDI is self-report — social desirability if not anonymous; common method bias if same mood affects all facet ratings.
Improvement: Anonymous administration, longitudinal repeats, combine with objective data (absence, exit interviews).
Evaluation: Standardised scales allow cross-company comparison but may not capture organisation-specific concerns. Discrepancy theory suggests measuring expectations vs reality, not just current satisfaction.