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| Step | Comments |
|
| Statement of purpose of measure | Should be explicitly stated a priori |
| Methods of item generation | From the literature, expert opinion, patient opinion, consensus methods
Item list should be comprehensive |
| Method to identify number of factors or constructs | For example, principal component and factor analysis |
| Derivation sample | Across spectrum of disease activity, academic and community clinics, ideally |
| Clinicians involved | Clinicians deriving criteria should be different than those providing cases/controls |
| Definition of gold standard | Validated set of criteria or expert opinions |
| Technique for selection of final set of items | For example, sensitivity/specificity, ROC curve, and regression models |
| Assessment of psychometric properties | Feasibility, face validity, content validity, reliability, construct validity, and responsiveness |
| External validation of criteria set | Distinct validation sample |
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