Evolving requirements for multifaceted systems are increasing pressure on organisations to rapidly integrate novel features and functions from various design disciplines. This creates a design challenge not only to implement the novel features or functions into an existing system, but to also manage uncertainties around whether an adapted system fulfils its intended function. To ensure that such uncertainty does not eventuate into function failure, designers must be able to effectively analyse risk to function fulfilment as it emerges in design. This paper proposes the novel Function Integrity Diagnosis and Documentation (FIDD) method, which is aimed at supporting the adaptation of existing systems by offering an approach to advance risk assessment into earlier design stages. An industrial case study is presented to explain method application and demonstrate a proof of concept. The paper concludes with a discussion of impacts to related theory and limitations that motivate future research.

对多方面系统不断变化的需求给组织带来了越来越大的压力，他们需要快速集成来自不同设计学科的新特性和功能。这带来了设计挑战，不仅要在现有系统中实现新颖的特征或功能，还要管理调整后的系统是否满足其预期功能的不确定性。为确保这种不确定性不会最终导致功能失效，设计人员必须能够有效地分析设计中出现的功能实现风险。本文提出了新的功能完整性诊断和文档 (FIDD) 方法，该方法旨在通过提供一种将风险评估推进到早期设计阶段的方法来支持现有系统的适应。提供了一个工业案例研究来解释方法应用并演示概念验证。本文最后讨论了对相关理论的影响和激励未来研究的局限性。