This dissertation aims to clarifiy (1) the internal structure of social intelligence (SI) and auditory intelligence (AuI), (2) their relationship to academic intelligence (AcI), and (3) their relationship to one another. The framework of Süß (1996, 2001) was applied in order to investigate SI and AuI with respect to their degree of generality and their position within the nomological network of established constructs. In addition, performance measures requiring only basic knowledge were developed in order to be able to produce test data. The Social Intelligence Test of Magdeburg (SIM) relies on written, auditory, pictorial, and video-based material to measure the cognitive operations social understanding, social memory, and social perception. The Auditory Intelligence Test (AuIT) based on the work of Stankov and Horn (1980) was further developed to assess the cognitive operations reasoning, memory, and discrimination using auditory nonverbal, and auditory speech material. Two experiments tested the assumption that SI and AuI can be measured reliably and that they are separable from but positively related to AcI, represented by the Berlin Intelligence Structure model (BIS, e.g. Jäger, 1982). The first sample consisted of 126 students (53.5% female) of different faculties, 21 years old (SD=3.06). In the second study 182 subjects (58.8% female), 23-40 years old (M=28.69; SD=5.57) with different levels of education and proficiency, participated. Besides the SIM and AuIT, the test takers worked on the BIS-4 Test (Jäger, Süß, & Beauducel, 1997), working memory capacity tasks (see Oberauer, Süß, Wilhelm, & Wittmann, 2003), and selected sentences of the Geneva Vocal Emotion Expression Stimulus Set (GVEESS, see Banse & Scherer, 1996). The SI subconstructs social memory and social understanding were moderately correlated and could be confirmed in both studies. In the second study, the social perception factor split into three minimally to moderately intercorrelated parts: written, auditory paraverbal/emotion, and nonverbal perception. Both studies provided confirmation for the content structure of AuI (nonverbal vs. speech), while the operation structure could not be confirmed. Social understanding and nonverbal AuI were completely independent from AcI and working memory, whereas the remaining subconstructs were related to AcI in different degrees. Social/emotional auditory perception including the GVEESS was independent from nonverbal auditory ability but correlated with a spoken language factor consisting of auditory speech tasks, auditory social understanding, and auditory social memory tasks. The results indicate that parts of social and auditory intelligence are promising candidates for useful ability constructs. Future research has to show whether they remain stable with time and can make an incremental contribution to predicting appropriate external criteria when compared to established ability constructs.