Core self-evaluations (CSE) and Psychological Capital (PsyCap) each consist of four first-order dimensions, and the two constructs are strong predictors of personal and organizational outcomes. Despite their similarities, much is still unknown regarding the manner in which the two constructs are distinct Also, while both constructs are described as positive attributes, the most popular CSE and PsyCap scales include items that represent negative attributes. We suggest that these items may represent two alternative constructs - Negative CSE and Negative PsyCap. Through a series of three studies, we address these research questions. We show that, although strongly related, the constructs Of CSE and PsyCap represent two distinct factors, even when the scale instructions provide a common temporal stability and/or specificity. We also show that the two most popular CSE and PsyCap scales are best represented by four factors that represent CSE, PsyCap, Negative CSE, and Negative PsyCap. As two separate dimensions emerged for the items describing negative attributes, this finding suggests that the factors representing the negative items are more than artifactors alone. We discuss the implications of these findings in regards to the measurement of CSE and PsyCap as well as the future study of Negative CSE and Negative PsyCap. (C) 2017 Elsevier Ltd. All rights reserved.