TY - GEN A1 - Kappel, Antonia A1 - Buchholz, Wolfgang T1 - Application of a Supply Net Mapping Model to improve strategic sourcing in the agricultural machinery industry. 25th Annual International Purchasing and Supply Education and Research Association (IPSERA) Conference: "Purchasing & Supply Management - from efficiency to effectiveness in an integrated Supply Chain Management". Dortmund, Germany. Y1 - 2016 ER - TY - GEN A1 - Kappel, Antonia A1 - Schiele, Holger A1 - Buchholz, Wolfgang T1 - How to capture suppliers’ relationships with competitors and complementors? - An approach to supply network mapping using a World Café method, 26th Annual International Purchasing and Supply Education and Research Association (IPSERA) Conference: "Coping with the Future: Picking your Battles", Budapest/Balatonfured, Hungary Y1 - 2017 ER - TY - GEN A1 - Kappel, Antonia A1 - Schiele, Holger A1 - Buchholz, Wolfgang T1 - Supplier relationships with competing customers - How can purchasers find out who is the preferred customer?, 27th Annual International Purchasing and Supply Education and Research Association (IPSERA) Conference: "Purchasing and Supply Chain Management: Fostering Innovation", Athens, Greece. Y1 - 2018 ER - TY - CHAP A1 - Buchholz, Wolfgang A1 - Kappel, Antonia A1 - Albersmann, Aline A1 - Huang, Jian T1 - Conceptualisation of a preventive and reactive supply chain risk management approach to manage supply shortages T2 - IPSERA Conference proceedings N2 - Particularly in times of disruptive changes, companies need an early warning system for risks in their supply chains to gain relevant information in a timely manner. Furthermore, they require suitable action plans and strategies to help react when a risk occurs. Based on an in-depth case study at an automotive parts supplier producing electronic systems and lighting components, this paper develops a holistic supply chain risk management framework. After investigating the specific supply chain risks to support critical parts management, standardised processes and procedures are developed to improve the preventive supply chain risk strategy cycle, as well as the reactive critical parts management cycle. Y1 - 2019 SP - 1 EP - 17 ER - TY - CHAP A1 - Buchholz, Wolfgang A1 - Jeschke, Felix A1 - Kappel, Antonia A1 - Ruppe, Cathrin T1 - One way or another – The relationship between trust and transparency in buyer-supplier relationships T2 - IPSERA Conference proceedings N2 - Based on a variety of environmental, technological, and product-orientated changes, there has been a shift towards increased collaboration between buyers and suppliers. This paper examines the mutual influence of trust and transparency at different developmental stages of these collaborative relations. In particular, the research investigates the existence of a direct correlation between trust and transparency, as well as indirect dependencies to each other through environmental factors. An extensive literature review combined with an exploratory-qualitative World Café method was conducted in an attempt to fill the research gap regarding the correlation of trust and transparency in buyer-supplier relationships. Y1 - 2019 SP - 1 EP - 14 ER - TY - CHAP A1 - Buchholz, Wolfgang A1 - Kappel, Antonia A1 - Schiele, Holger T1 - Cost versus Innovation Leaders: When do they need Supply Network Mapping? The impact of SNM on purchasing performance T2 - IPSERA Conference proceedings N2 - Buying firms lack transparency about the supplier relationships in their networks. The applica-tion of dedicated tools such as Supply Network Mapping (SNM) can help to visualize and analyze these relationships. However, the impact of such tools on the purchasing performance has not been explored yet. Moreover, companies with different competitive strategies might have different motivations to use these tools. Therefore, this paper tests the impact of supplier relationship information and SNM on the purchasing performance on a large sample of 624 purchasers. A multi-group analysis in structural equation modeling estimates the impact of a cost leadership versus a differentiation strategy on cost saving and innovation performance. We show that information quality and SNM indeed improve the purchasing performance. Moreover, cost leaders use SNM if they know their supplier relationships with sub-suppliers, while innovation leaders use it if they know their supplier relationships with other customers. Hence, our results prove the usefulness of the SNM tool and give recommendations for its use depending on a company’s competitive strategy. Y1 - 2019 SP - 1 EP - 19 ER - TY - CHAP A1 - Buchholz, Wolfgang A1 - Kappel, Antonia A1 - Schiele, Holger T1 - Knowing your suppliers: people or media as key sources of information? T2 - IPSERA Conference proceedings N2 - Most companies have realized the high importance of becoming the preferred customers of their suppliers to obtain preferential resource allocation. However, they cannot evaluate their own customer attractiveness properly. In order to make the assessment of the own customer status possible, this paper analyzes the impact of several information sources on the preferred customer status knowledge, supplier satisfaction knowledge and knowledge of alternative supplier relationships with other customers. Testing these hypotheses on a sample of 624 pur-chasers, we show that people provide more relevant information on the company’s strategic positioning than media. In particular, the suppliers, competitors and other actors are very im-portant information sources. Following our findings, purchasers should adopt their activities in order to better anticipate their suppliers’ intention and the customer treatment that they can expect from their suppliers. Y1 - 2019 SP - 1 EP - 21 ER - TY - CHAP A1 - Buchholz, Wolfgang A1 - Kappel, Antonia A1 - Schiele, Holger T1 - Supplier relationships with competing customers - How can purchasers find out who is the preferred customer? T2 - IPSERA Conference proceedings N2 - Focal companies are embedded in complex supply networks consisting of various suppliers, customers, competitors and complementors. The activities of these actors influence the com-petitive position of the focal companies. Some customers achieve preferred customer status and gain preferential treatment, others have to restrain to being standard customers getting less privileged services. Consequently, buying companies in such markets have to achieve transparency about the relationships of their suppliers towards their competitors and comple-mentors in order to map them and to analyse their impact. Current literature lacks a holistic approach to capture these relationships. In which sources can the focal companies find the desired information? Which kind of information do they really need? And in which situations is the need for transparency high and when is it low? The aim of this research is to examine these relationships using a World Café method with purchasers for data gathering followed by a Gioia method to structure the qualitative data. The result is a list of desired knowledge cov-ering business, supplier and collaboration details; a set of information sources clustered in pub-lished and unpublished sources as well as contingency factors regarding general conditions, changes and particular occasions that require a high supplier relationship knowledge. All an-swers have been rated by their importance during the World Café. The answers can help to operationalise the mapping of supplier relationships towards competitors and complementors in order to assess the own customer status compared to other customers. KW - Supply network mapping Y1 - 2018 SP - 1 EP - 23 ER - TY - CHAP A1 - Buchholz, Wolfgang A1 - Kappel, Antonia T1 - Purchasing in service networks: The impact of high visibility on purchasing performance T2 - IPSERA Conference Proceedings N2 - While the service sector is growing rapidly, the purchasing of services has not yet received significant attention in theory or practice. Service purchasers face serious challenges, and existing purchasing practices for services are often non-strategic. We choose an exploratory–qualitative research approach to investigate the purchasing of IT, logistics and Maintenance, Repair, and Overhaul (MRO) services. In particular, we focus on the role of visibility and analyze how service purchasers can benefit from extensive knowledge about their service networks. We determine that visibility indeed adds significant value to service purchasing and can help service purchasers to decrease costs, mitigate risks and maintain competitiveness. Y1 - 2020 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:hbz:836-opus-137427 SP - 1 EP - 25 PB - IPSERA ER -