Negative symptoms—such as avolition, anhedonia, alogia, affective flattening, and social withdrawal—are central to schizophrenia and have a profound impact on real-life functioning, including social relationships, vocational engagement, and independent living. The assessment of these two domains has traditionally been approached separately, yet there is growing recognition of their substantial overlap. Negative symptoms, particularly diminished motivation and social drive, closely mirror impairments in functional outcomes, making it challenging to distinguish between symptom severity and the consequences of those symptoms on daily life. This overlap raises important methodological and clinical concerns, such as the potential for redundancy in measurement tools and misinterpretation of treatment effects. Current assessment instruments, including the Positive and Negative Syndrome Scale, the Brief Negative Symptom Scale, and the Scale for the Assessment of Negative Symptoms for negative symptoms, and tools like the Personal and Social Performance Scale and Specific Levels of Functioning Scale for functioning, often fail to fully disentangle intrinsic motivation deficits from observable performance. Moreover, the subjective experience of patients and contextual factors (e.g., environmental support, stigma) are frequently underrepresented. There is a critical need for integrative, multidimensional assessment strategies that capture both domains while maintaining conceptual clarity. Advances in real-time, performance-based, and ecologically valid assessment tools may enhance our ability to understand the dynamic interplay between negative symptoms and functioning. Improved assessment can lead to more precise interventions, better monitoring of treatment response, and ultimately, enhanced functional recovery for individuals with schizophrenia.