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A critical realist approach to agent-based modeling: Unlocking prediction in non-positivist paradigms 基于代理建模的批判现实主义方法:在非实证主义范式中解开预测之谜
IF 5.6 3区 管理学 Q1 COMPUTER SCIENCE, INFORMATION SYSTEMS Pub Date : 2024-09-07 DOI: 10.1177/02683962241280657
Annamina Rieder, Saurav Chakraborty, Sandeep Goyal, Donald J Berndt
Information systems (IS) scholarship and practice aim to predict phenomena and outcomes of IS use. These phenomena of IS use are typically set in multi-leveled, dynamic, and complex contexts that lend explanation to the non-positivist tradition in IS research. However, limited methodological options exist to make predictions. In this research, we propose stratified agent-based modeling, a step-by-step approach that enables prediction in non-positivist paradigms. Drawing upon the critical realist philosophy of science, which suggests ontological stratification and assumes open systems, we adopt a retroduction-based explanation formation and agent-based modeling to simulate different potential states of a complex system. The critical step in combining critical realism with agent-based modeling involves identifying and codifying the underlying generative mechanisms (i.e., causal powers) into various components of the agent-based model. We propose four steps toward prediction under the critical realist paradigm: (1) capturing the phenomenon, (2) identifying the generative mechanism, (3) building the agent-based model, and (4) simulating states of the system. We present an exemplar of our proposed approach that investigates the effectiveness of strategies to combat malicious content propagation in social networks.
信息系统(IS)的学术研究和实践旨在预测 IS 使用的现象和结果。这些使用信息系统的现象通常是在多层次、动态和复杂的背景下出现的,这就为信息系统研究中的非实证主义传统提供了解释。然而,用于预测的方法却很有限。在这项研究中,我们提出了基于分层代理的建模方法,这是一种能够在非实证主义范式中进行预测的循序渐进的方法。批判现实主义科学哲学提出本体论分层并假定系统是开放的,我们借鉴这一哲学,采用基于逆向归纳的解释形成和基于代理的建模来模拟复杂系统的不同潜在状态。将批判现实主义与基于代理的建模结合起来的关键步骤是识别潜在的生成机制(即因果力量)并将其编入基于代理的模型的各个组成部分。我们提出了在批判现实主义范式下进行预测的四个步骤:(1) 捕捉现象,(2) 识别生成机制,(3) 建立基于代理的模型,(4) 模拟系统状态。我们介绍了我们提出的方法的一个范例,该范例研究了打击社交网络中恶意内容传播的策略的有效性。
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引用次数: 0
A Temporal Dynamics Framework and Methodology for Computationally Intensive Social Media Research 用于计算密集型社交媒体研究的时态动力学框架和方法论
IF 5.6 3区 管理学 Q1 COMPUTER SCIENCE, INFORMATION SYSTEMS Pub Date : 2024-08-29 DOI: 10.1177/02683962241283051
Shohil Kishore, David Sundaram, Michael David Myers
The growing availability of expansive social media trace data (SMTD) offers researchers promising opportunities to create rich depictions of societal and social phenomena. Despite this potential, research analysing such datasets often struggles to construct novel theoretical insight. This paper argues that holistically incorporating temporality enhances data collection and data analysis, thereby facilitating process theory construction from SMTD. Recommendations to integrate temporality are outlined in the proposed Temporal Dynamics Framework and Methodology (TDFM). We apply the TDFM to investigate the temporal dynamics of mental health discourse on Twitter (now X) across different phases of the COVID-19 pandemic, theoretically framed in the context of innate psychological needs satisfaction. The findings reveal dynamic shifts in social media use, indicating that different phases of the pandemic triggered dynamic shifts in the needs motivating, and being motivated by, social media use. This illustrative case reflectively evaluates the usefulness of the TDFM in contextualising SMTD collection, analytical strategies, and process theory construction by incorporating a dynamic perspective on time.
日益广泛的社交媒体痕迹数据(SMTD)为研究人员创造丰富的社会和社会现象描述提供了大有可为的机会。尽管潜力巨大,但分析此类数据集的研究往往难以构建新颖的理论见解。本文认为,从整体上融入时间性可以加强数据收集和数据分析,从而促进从 SMTD 中构建过程理论。本文提出的 "时间动力学框架与方法"(TDFM)概述了整合时间性的建议。我们运用 TDFM 研究了 Twitter(现在的 X)上的心理健康言论在 COVID-19 大流行的不同阶段的时间动态,并以先天心理需求满足为理论框架。研究结果揭示了社交媒体使用的动态变化,表明大流行病的不同阶段引发了社交媒体使用动机和动机需求的动态变化。这一说明性案例通过纳入时间动态视角,对 TDFM 在 SMTD 收集、分析策略和过程理论构建方面的有用性进行了反思性评估。
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引用次数: 0
A Qualitative Systematic Review of Trust in Technology 对技术信任的定性系统回顾
IF 5.6 3区 管理学 Q1 COMPUTER SCIENCE, INFORMATION SYSTEMS Pub Date : 2024-04-27 DOI: 10.1177/02683962241254392
Sebastian Schuetz, Le Kuai, Mary C Lacity, Zach Steelman
Although many information systems (IS) scholars have researched the antecedents and consequences of trust in technology, the sheer amount of work published, authors’ use of inconsistent construct terms, and variations in conceptualization and measurement make it difficult to compare and aggregate findings across studies. To provide scholars with an overview of the literature, we performed a systematic qualitative review of the IS literature. The goal of our review was to identify the antecedents and consequences of trust in technology that have received frequent empirical support, as well as those for which the evidence is not yet conclusive. To that end, we curated a glossary of unique construct terms and summarized the results of 241 relationships tested in 62 empirical research articles (both quantitative and qualitative) from the AIS “Basket of Eight” journals. From these, we identified 62 unique relationships: 22 are well-supported, six are supported by suggestive evidence, and 34 have received little support. These relationships summarize what is well-known and less well-known within the literature. By taking stock, we prepare a path for future research on the phenomenon of trust in the context of emerging technologies (e.g., artificial intelligence, blockchain). We conclude the paper with opportunities and directions for future research.
尽管许多信息系统(IS)学者对技术信任的前因后果进行了研究,但由于发表的论文数量庞大、作者使用的结构术语不一致以及概念化和测量方法的差异,很难对不同研究的结果进行比较和汇总。为了向学者们提供文献综述,我们对信息系统文献进行了系统的定性综述。我们回顾的目的是找出技术信任的前因后果,这些前因后果经常得到实证支持,而那些后果的证据尚无定论。为此,我们整理了一个独特的结构术语表,并总结了 AIS "八篮子 "期刊中 62 篇实证研究文章(包括定量和定性研究)中测试的 241 种关系的结果。从中,我们确定了 62 种独特的关系:22 种得到了充分的支持,6 种得到了暗示性证据的支持,34 种几乎没有得到支持。这些关系概括了文献中知名和不太知名的关系。通过总结,我们为未来研究新兴技术(如人工智能、区块链)背景下的信任现象铺平了道路。最后,我们提出了未来研究的机遇和方向。
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引用次数: 0
Vendor capabilities development in blockchain sourcing: a parallel play approach 区块链采购中的供应商能力开发:平行游戏法
IF 5.6 3区 管理学 Q1 COMPUTER SCIENCE, INFORMATION SYSTEMS Pub Date : 2024-01-03 DOI: 10.1177/02683962231226399
Yu Ji, Wenyu Du, Shan L. Pan
Vendor capabilities development has been an important research stream in the information systems (IS) sourcing literature. The existing research, which was based on the context of implementing centralized enterprise systems, focused on the adoption of deliberate learning and implicit learning, with the assumption that effective selection between these two learning approaches is sufficient for service providers to acquire vendor capabilities. However, this assumption may not hold in implementing a decentralized system based on enterprise blockchain. Because an enterprise blockchain system affords a new way of governing transactions and demands a new governance mode, it creates an uncertain and complex landscape in which the mere selection between deliberate learning and implicit learning becomes insufficient. Addressing this gap is crucial because many enterprise blockchain projects fail due to the incompetence of service providers. By conducting an in-depth case study of a successful blockchain service provider, our study reveals a new mechanism for developing vendor capabilities: parallel play. As with parallel play by preschoolers, the service provider combines a set of learning approaches featuring borrowing from peers and learning through experimentation. Our study extends the IS sourcing literature on vendor capabilities development from the context of implementing centralized enterprise systems to the context of implementing decentralized enterprise blockchain systems. Our findings also provide guidelines for blockchain service providers to follow when acquiring vendor capabilities and for clients to use when selecting service providers.
供应商能力开发一直是信息系统(IS)采购文献中的一个重要研究方向。现有研究基于实施中心化企业系统的背景,重点关注采用刻意学习和隐性学习,并假设在这两种学习方法之间进行有效选择足以使服务提供商获得供应商能力。然而,在实施基于企业区块链的去中心化系统时,这一假设可能不成立。因为企业区块链系统提供了一种新的交易管理方式,并要求一种新的管理模式,这就造成了一种不确定的复杂局面,在这种局面下,仅仅在刻意学习和隐性学习之间进行选择是不够的。解决这一差距至关重要,因为许多企业区块链项目都因服务提供商的无能而失败。通过对一家成功的区块链服务提供商进行深入案例研究,我们的研究揭示了一种开发供应商能力的新机制:平行游戏。与学龄前儿童的平行游戏一样,该服务提供商结合了一系列学习方法,包括向同行借鉴和通过实验学习。我们的研究将有关供应商能力开发的 IS 采购文献从实施集中式企业系统的背景扩展到实施去中心化企业区块链系统的背景。我们的研究结果还为区块链服务提供商在获取供应商能力时应遵循的准则以及客户在选择服务提供商时应使用的准则提供了参考。
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引用次数: 0
IT’s a Matter of Trust: Literature reviews and analyses of human trust in information technology 信息技术事关信任:关于人类对信息技术信任的文献综述和分析
IF 5.6 3区 管理学 Q1 COMPUTER SCIENCE, INFORMATION SYSTEMS Pub Date : 2024-01-03 DOI: 10.1177/02683962231226397
Mary C Lacity, S. Schuetz, Le Kuai, Zach Steelman
In this paper, we review and analyze two literatures on the construct of human trust in IT artifacts and in the entities that source, operate, and govern IT. The first literature review focuses on defining of the construct of trust across a range of disciplines. Our analysis of this literature identified 13 assumptions about the nature of trust. The assumptions illustrate the complexities of human trust. The second literature review focused on 214 empirical studies of the construct of trust published in the AIS Senior Scholars’ Basket of Eight journals. We analyze this literature to identify IS scholar’s most common assessments of trust from qualitative studies and most common measures of trust from quantitative studies. As a cumulative body of knowledge, IS scholars have deeply examined different types of trust. IS scholars have also extensively examined the assumption that trust is dynamic, as evidenced by the many qualitative papers that examined trust as a process, and trust in Web2 technologies, which are characterized by centralized applications and centralized governance. While the IS scholarly community has established a substantial tradition around the construct of trust, there is still interesting work to be done. With recent releases of open generative AI and with the rise of Web3 technologies like blockchains that purport to be “trustless”, the construct of trust in IT needs to be re-examined in these emerging contexts. We also encourage more research on trust in bi-directional relationships, on the limits of transitive trust, and on the construct of distrust.
在本文中,我们回顾并分析了关于人类对信息技术人工制品以及信息技术的来源、运营和管理实体的信任结构的两篇文献。第一篇文献综述的重点是界定各学科中的信任概念。通过对这些文献的分析,我们确定了有关信任本质的 13 项假设。这些假设说明了人类信任的复杂性。第二篇文献综述的重点是在 AIS 高级学者篮子中的八种期刊上发表的 214 篇有关信任构建的实证研究。我们对这些文献进行分析,从定性研究中找出 IS 学者最常用的信任评估方法,从定量研究中找出最常用的信任测量方法。作为知识的积累,信息系统学者深入研究了不同类型的信任。IS 学者还广泛研究了信任是动态的这一假设,许多定性研究论文将信任视为一个过程,以及对以集中式应用和集中式管理为特点的 Web2 技术的信任,都证明了这一点。虽然信息系统学术界已经围绕信任的构建建立了一个重要的传统,但仍有许多有趣的工作要做。随着最近开放生成式人工智能的发布,以及声称 "无信任 "的区块链等 Web3 技术的兴起,我们需要在这些新兴环境中重新审视信息技术中的信任结构。我们还鼓励对双向关系中的信任、传递性信任的局限性以及不信任的构造开展更多研究。
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引用次数: 0
Procuring Services through IT Crowdsourcing: The Role of IT Administration and IT Flexibility 通过 IT 众包采购服务:信息技术管理和信息技术灵活性的作用
IF 5.6 3区 管理学 Q1 COMPUTER SCIENCE, INFORMATION SYSTEMS Pub Date : 2023-12-22 DOI: 10.1177/02683962231225469
Joseph Taylor, KD Joshi, Terence Saldanha, Arvin Sahaym
Digital platforms provide organizations with new ways to conduct sourcing activities. Crowdsourcing has emerged as one potential method of sourcing various kinds of information technology (IT) services. Notwithstanding the benefits of IT crowdsourcing services (ITCS), there is a lack of clarity about why some firms procure services through ITCS, whereas others do not. Drawing on the organizational capabilities perspective, we hypothesize that in-house IT administration capability and IT flexibility jointly enhance a firm’s ITCS Platform Suitability Assessment, which, in turn, leads to higher ITCS Service Procurement. We also posit that ITCS Platform Suitability Assessment mediates the relationship between IT Administration Capability and ITCS Service Procurement. Our empirical analysis of survey data from 308 firms in United States supports our hypotheses. Our results suggest that firms that develop IT administrative capabilities and IT flexibility assess ITCS platform characteristics as more suitable for ITCS-related activities. ITCS Platform Suitability Assessment, in turn, drives firms to procure operational services (e.g., setting up automatic payments) and strategic services (e.g., project management) from the loose configuration of workers in the gig economy. Our results contribute to theory by positing and testing a theoretical model that expands the theoretical base used to explain ITCS sourcing. We discuss the implications for the business value of IT platforms, organizational structure, and capabilities in regard to future sourcing strategies.
数字平台为企业提供了开展采购活动的新方法。众包已成为采购各种信息技术(IT)服务的一种潜在方法。尽管信息技术众包服务(ITCS)好处多多,但为什么有些公司通过ITCS采购服务,而另一些公司却没有呢?从组织能力的角度出发,我们假设企业内部的信息技术管理能力和信息技术灵活性会共同提高企业的ITCS平台适用性评估,进而提高ITCS服务采购量。我们还假设,ITCS 平台适宜性评估是 IT 管理能力与 ITCS 服务采购之间关系的中介。我们对美国 308 家公司的调查数据进行了实证分析,结果支持了我们的假设。我们的结果表明,那些具备 IT 管理能力和 IT 灵活性的公司会评估 ITCS 平台特征,认为其更适合 ITCS 相关活动。ITCS平台适用性评估反过来又促使企业从 "打工经济 "中松散的工人配置中采购运营服务(如设置自动付款)和战略服务(如项目管理)。我们的研究结果提出并检验了一个理论模型,扩展了用于解释 ITCS 采购的理论基础,从而为理论做出了贡献。我们讨论了 IT 平台的商业价值、组织结构和能力对未来采购战略的影响。
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引用次数: 0
Empowering Digital Transformation: The Roles of Platforms 助力数字化转型:平台的作用
IF 5.6 3区 管理学 Q1 COMPUTER SCIENCE, INFORMATION SYSTEMS Pub Date : 2023-11-23 DOI: 10.1177/02683962231219520
Liang-liang Li, Kui Du, Wei Zhang, Ji-Ye Mao
This study investigates how digital platforms can drive the digital transformation of participant firms in the surrounding business ecosystems. To do so, we conduct an in-depth case study of Alibaba’ cross-border e-commerce platform and eleven seller firms operating on the platform. Our results highlight the importance of proper empowerment in platform-driven digital transformation. In particular, we observe that Alibaba attempts to facilitate the digital transformation of seller firms through three types of activities: resource empowerment, psychological empowerment, and structural empowerment. Moreover, we find that the sequence of these empowerment activities plays a critical role. Without being psychologically empowered first, seller firms react quite passively to Alibaba’s resource provision and structural support. Psychological empowerment provides the activation triggers for the sellers to renew their mindsets and become receptive to Alibaba’s support and guidance, which ultimately contribute to the digital transformation of their businesses.
本研究探讨了数字平台如何推动周边商业生态系统中参与企业的数字化转型。为此,我们对阿里巴巴跨境电子商务平台和平台上的 11 家卖家企业进行了深入的案例研究。我们的研究结果凸显了适当授权在平台驱动的数字化转型中的重要性。我们特别注意到,阿里巴巴试图通过三类活动促进卖家企业的数字化转型:资源赋能、心理赋能和结构赋能。此外,我们还发现,这些赋能活动的顺序起着至关重要的作用。如果不先进行心理赋权,卖家企业对阿里巴巴的资源提供和结构支持的反应就会相当被动。心理赋权为卖家提供了激活触发器,使其更新心态,乐于接受阿里巴巴的支持和指导,最终促进其业务的数字化转型。
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引用次数: 0
TOWARDS A CONTEXT-SENSITIVE CONCEPTUALISATION OF DIGITAL TRANSFORMATION 实现对情境敏感的数字化转型概念化
IF 5.6 3区 管理学 Q1 COMPUTER SCIENCE, INFORMATION SYSTEMS Pub Date : 2023-11-23 DOI: 10.1177/02683962231219514
Manuel Muehlburger, Barbara Krumay
Digital transformation is a phenomenon perceived across a multitude of contexts in the organizational societal and individual domains. Conceptualizing this broad phenomenon requires an approach that provides structure and comparability across contexts and domains whilst containing sufficient contextual detail and specificity to avoid conceptual stretching. Utilizing a multi-method approach this paper draws from a set of empirical data to develop such a context-sensitive conceptualization for digital transformation. Utilizing a design perspective on digital transformation this paper (1) develops a conceptual meta-structure capable of representing instances of digital transformation independent of domain and context and (2) develops a taxonomy of context-specific categories for the identified meta-elements. The three elements Representation, Technology, and Effect (RTE) constitute the meta-structure, the taxonomy is comprised of seven representation, ten technology and nine effect categories. We evaluated our results utilizing a card sorting approach in a workshop setting. The proposed conceptualization is capable to accommodate context-specific manifestations of digital transformation in all tested environments thereby indicating its applicability as a foundation for a context-sensitive conceptualization of digital transformation. The paper contributes to the evolving body of literature on digital transformation by providing a conceptual meta-structure capable of capturing manifestations of digital transformation in a uniform and structured manner across domains and contexts.
数字化转型是一种在组织、社会和个人领域的多种背景下都能感知到的现象。要将这一广泛的现象概念化,需要一种既能提供跨背景和跨领域的结构和可比性,又能包含足够的背景细节和特殊性以避免概念延伸的方法。本文采用多种方法,从一系列经验数据中汲取营养,为数字化转型提出了这样一种对情境敏感的概念。本文利用数字化转型的设计视角,(1) 建立了一个概念元结构,能够代表独立于领域和情境的数字化转型实例;(2) 为确定的元要素建立了一个特定情境类别分类法。元结构由表征、技术和效果(RTE)三要素构成,分类法由七个表征类别、十个技术类别和九个效果类别组成。我们在研讨会上采用卡片排序法对结果进行了评估。所提出的概念化能够在所有测试环境中适应数字化转型的具体环境表现,从而表明它可以作为对环境敏感的数字化转型概念化的基础。本文提供了一种概念元结构,能够以统一和结构化的方式捕捉跨领域和跨情境的数字化转型表现形式,为不断发展的数字化转型文献做出了贡献。
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引用次数: 0
Disruptive change within Financial Technology – a methodological analysis of the Digital Transformation challenges 金融科技领域的颠覆性变革--对数字化转型挑战的方法论分析
IF 5.6 3区 管理学 Q1 COMPUTER SCIENCE, INFORMATION SYSTEMS Pub Date : 2023-11-23 DOI: 10.1177/02683962231219512
Laurie Hughes, Jonathan Seddon, Yogesh K. Dwivedi
The digital transformation of the FinTech industry, has revealed a plethora of significant challenges for industry decision makers and wider stakeholder groups as organisations contend with the onset of new regulatory frameworks, legacy systems, flexible business models, and alignment with corporate social responsibility practice. The reshaping of organisations and drive to greater levels of decentralisation and employee centric practice, presents a cultural shift for the sector, with implications for the success and resulting benefits of change across the industry. This study aims to develop novel insight to the “lived in” impact of digital transformation within the FinTech industry from a factor interdependency perspective. This research adopts a mixed methods approach incorporating Interpretive Structural Modelling, Analytical Hierarchy Process and interviews with expert participants to offer a unique perspective on the challenges and unintended consequences of industry level technological change. The findings highlight the high levels of interdependency and priority for challenges related to the investment in products and infrastructure for new markets, criticality of stakeholder support and development of a digital mindset for the adoption of new technologies.
金融科技行业的数字化转型为行业决策者和更广泛的利益相关群体带来了大量重大挑战,因为各组织需要应对新的监管框架、遗留系统、灵活的业务模式以及与企业社会责任实践的一致性。组织结构的重塑、更大程度的权力下放以及以员工为中心的做法,为该行业带来了文化转变,并对整个行业变革的成功和由此产生的效益产生了影响。本研究旨在从因素相互依存的角度,对金融科技行业数字化转型的 "实际 "影响提出新的见解。本研究采用混合方法,结合解释性结构建模、层次分析法和对专家参与者的访谈,以独特的视角探讨行业级技术变革所带来的挑战和意外后果。研究结果凸显了与新市场产品和基础设施投资相关的高度相互依存性和挑战的优先性、利益相关者支持的关键性以及为采用新技术而发展数字化思维的重要性。
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引用次数: 0
Digitalization and network capability as enablers of business model innovation and sustainability performance: The moderating effect of environmental dynamism 数字化和网络能力是商业模式创新和可持续发展绩效的促进因素:环境活力的调节作用
IF 5.6 3区 管理学 Q1 COMPUTER SCIENCE, INFORMATION SYSTEMS Pub Date : 2023-11-23 DOI: 10.1177/02683962231219513
Ying Li, Lili Cui, Lin Wu, Paul Benjamin Lowry, Ajay Kumar, Kim Hua Tan
As a multidisciplinary maneuver accelerated by the global pandemic, digital transformation involves changes in technological development, organizational processes, inter-organizational relationships, and business models that influence the organization’s performance and the wider environment. To better understand the inherent mechanisms of digital transformation and their positive and negative outcomes, researchers and practitioners are exploring how and when digitalization—that is, the application of digital technologies—can lead to superior sustainability performance. Based on dynamic capabilities theory, we investigate the influence of digitalization and network capability on firms’ sustainability performance, and we propose that business model innovation (BMI) plays a mediating role while environmental dynamism plays a moderating role. Both economic and environmental performance are considered subdimensions of sustainability. We examine Chinese manufacturing firms because they are under tremendous pressure to undertake digital transformation. To achieve broad generalizability, our survey-based methodology targeted 1,600 firms; we received 255 completed and validated responses. The results indicate that the effects of digitalization on novelty- and efficiency-centered BMI are mediated by network capability and that both novelty- and efficiency-centered BMI mediate the effects of digitalization and network capability on economic and environmental performance. Environmental dynamism also negatively moderates the relationship between digitalization and efficiency-centered BMI; however, it positively moderates the effect of network capability on efficiency-centered BMI. This study provides theoretical and managerial insights into organizations’ trajectories toward digital transformation and sustainable development, with special applicability to Chinese manufacturing firms.
数字化转型是一场因全球大流行病而加速的多学科演习,它涉及技术发展、组织流程、组织间关系和商业模式等方面的变化,影响着组织的绩效和更广泛的环境。为了更好地理解数字化转型的内在机制及其积极和消极的结果,研究人员和从业人员正在探索数字化--即数字技术的应用--如何以及何时能够带来卓越的可持续发展绩效。基于动态能力理论,我们研究了数字化和网络能力对企业可持续发展绩效的影响,并提出商业模式创新(BMI)起着中介作用,而环境活力起着调节作用。经济绩效和环境绩效都被视为可持续发展的子维度。我们对中国制造业企业进行了研究,因为它们面临着进行数字化转型的巨大压力。为了实现广泛的普适性,我们采用了基于调查的方法,以 1,600 家企业为调查对象;我们收到了 255 份完整有效的回复。结果表明,数字化对以新颖性和效率为中心的BMI的影响是由网络能力中介的,而以新颖性和效率为中心的BMI则中介了数字化和网络能力对经济和环境绩效的影响。环境动态也负向调节数字化与以效率为中心的业务绩效指数之间的关系,但它正向调节网络能力对以效率为中心的业务绩效指数的影响。本研究为组织的数字化转型和可持续发展轨迹提供了理论和管理见解,尤其适用于中国制造业企业。
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引用次数: 1
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