The multi-method and multi-perspective approach is recommended for job analyses to ensure the validity of the assessment process, but has not been sufficiently addressed in studies so far. Therefore, the effects of a combined approach concerning two time perspectives (present- vs. future-oriented) and two sources of information (incumbents vs. supervisors) were analyzed in four independent job analyses. Across all four samples both time perspectives as well as both sources of information made a substantial contribution to the behavior descriptions of the resulting requirement profiles, indicating that a more complete picture of the job requirements results from the use of a multi-perspective approach. Logistic regression revealed an incremental value of combining both sources of information, and both time perspectives, respectively. This underlines demands to combine different approaches (cf. Morgeson & Campion, 1997) and gives them an empirical basis.