Several approaches and corresponding definitions of complexity have been developed in different fields. Urban systems are the archetype of complex socio-technical systems concerned with these different viewpoints. We suggest in this chapter some links between three types of complexity, namely emergence, computational complexity and informational complexity. We discuss the implication of these links on the necessity of reflexivity to produce a knowledge of the complex, and how this connects to the interdisciplinary of approaches in particular for socio-technical systems. We finally synthesize this positioning as a proposal of an epistemological framework called applied perspectivism, and discuss the implications for the study of urban systems.

中文翻译：

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复杂系统反思性研究的相关复杂性

不同领域已经开发了几种方法和相应的复杂性定义。城市系统是与这些不同观点相关的复杂社会技术系统的原型。我们在本章中建议了三种复杂性之间的一些联系，即涌现、计算复杂性和信息复杂性。我们讨论了这些联系对产生复杂知识的反思性的必要性的含义，以及这如何与跨学科的方法联系起来，特别是对于社会技术系统。我们最终将这种定位综合为一种称为应用视角主义的认识论框架的提议，并讨论了对城市系统研究的影响。