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Several hypotheses about aspect in Spanish SLA focus on postulating patterns a learner will go through. The Lexical Aspect Hypothesis (Andersen, 1986, 1991) and the Default Past Tense Hypothesis (Salaberry, 1999) are two examples discussed in recent studies (see e.g. Comajoan, 2013). This chapter shows that our results obtained via Grammaticality Judgments and a Production Task do not align completely with any of these hypotheses. Instead, individual differences (Dörnyei, 2006) must be considered, which a comparison between 61 German and 70 Romance speakers supports. Findings reveal some general attainment difficulties for all learners, but the emerging structures are not universal. Interestingly, our native control group (n = 15) also shows high variation, strengthening the observation that the selection of a tense-aspect form is heavily dependent on subjectivity.

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