Setting the right approach for new product development (NPD) in the presence of uncertainty remains an ongoing debate in innovation management. Stage-gate systems (SGS) and agile methodology (AM) are the dominant approaches. Recently, hybrid approaches (combining SGS and AM) have been proposed. Although these hybrid approaches represent a significant development in NPD, combining them without considering their design principles might lead to contradictory and competing conceptual formulations, thus increasing the difficulty of comparison among studies. Moreover, scholars and practitioners may struggle to understand when, why and how a certain configuration of the NPD process provides the right response to different manifestations of uncertainty. The current literature faces problems regarding the clarity of design principles (e.g. flexibility and adaptability), and this has led to research gaps concerning the uncertainty contingency and outcomes of hybrid approaches. This study combines bibliometric and content analyses to identify four design parameters and principles of NPD hybrid approaches: flexibility, adaptability, velocity and integration. Our findings might help advance the development and comparison of different hybrid approaches.

中文翻译：

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新产品开发中混合方法的设计原则：系统文献综述

在存在不确定性的情况下为新产品开发 (NPD) 制定正确的方法仍然是创新管理中正在进行的辩论。阶段门系统 (SGS) 和敏捷方法 (AM) 是主要方法。最近，已经提出了混合方法（结合 SGS 和 AM）。尽管这些混合方法代表了 NPD 的重大发展，但在不考虑其设计原则的情况下将它们结合起来可能会导致相互矛盾和相互竞争的概念表述，从而增加研究之间比较的难度。此外，学者和从业者可能难以理解 NPD 过程的特定配置何时、为何以及如何对不确定性的不同表现提供正确的响应。当前的文献在设计原则的清晰度方面面临着问题（例如 灵活性和适应性），这导致了关于混合方法的不确定性偶然性和结果的研究空白。本研究结合文献计量和内容分析来确定 NPD 混合方法的四个设计参数和原则：灵活性、适应性、速度和集成。我们的发现可能有助于推进不同混合方法的开发和比较。