Reliability analysis

internal consistency and what Cronbach's alpha actually measures; alpha thresholds and why 0.95 is a warning rather than a triumph; reverse scoring before you run it, not after; the menu path; reading the output - item-total correlations and alpha-if-item-deleted - and the discipline of not deleting items just to raise alpha; McDonald's omega and when to prefer it; split-half; intraclass correlation for inter-rater reliability, including choosing the right ICC model; test-retest; how to report reliability.