We begin by charting the evolution of the dominant perspective on job performance from one that viewed performance as static to one that viewed it as dynamic over long timeframes (e.g., months, years, decades) to one that views it as dynamic over not just long but also short timeframes (e.g., minutes, hours, days, weeks)—and that accordingly emphasizes the within-person level of analysis. The remainder of the article is devoted to the newer, short-timeframe research on within-person variability in job performance. We emphasize personality states and affective states as motivational antecedents. We provide accessible reviews of relevant theories and highlight the convergence of theorizing across the personality and affect antecedent domains. We then focus on several major avenues for future research. Finally, we discuss the implications of these perspectives for personnel selection and performance management in organizations as well as for employees aiming to optimize their job performance.

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