Source [[Article - A systematic review of momentary assessment designs for mood and anxiety symptoms]] "When implementing EMA methods, using questionnaires designed and validated for cross-sectional data collection is also a common yet questionable research practice (Flake and Fried, 2019). These types of questionnaires may not be appropriate or transferable to an intensive longitudinal design (Moskowitz et al., 2009). For example, if a cross-sectionally validated questionnaire asks about weekly symptoms, administering this questionnaire multiple times per day would render its validity questionable (Hufford, 2007). Stone and colleagues additionally report that different temporal contextualizations in the instructions (e.g., today vs. in the last day) led to a difference in reported affective states (Stone et al., 2020). These differences may be subtle, but indicate that even small sources of measurement heterogeneity can have wide-reaching consequences. Providing clear and intentionally-selected timeframes for items, remaining consistent with them throughout the questionnaire, is therefore recommended to avoid confusion and misinterpretation by the participant."