Nowadays, the aspects of managing risks and building resilience are crucial for maintaining the continuity of business processes. Therefore, it is highly valuable to recognize those aspects that support such activities. The main purpose of this article is to investigate whether supplier involvement in product development (SIPD) affects the degree of supply chain risk and thus, indirectly impacts supply chain resilience. The study is based on a survey conducted among 500 manufacturing companies, from which several hypotheses have been defined and tested. This allowed the verification of a theoretical model covering the following three research areas: supplier involvement in product development, supply chain risks and supply chain resilience. In particular, the study confirmed that implementation of partnership practices during SIPD positively influences supply risk reduction, while extensive communication during SIPD minimizes operational risk for a company, i.e. risk of human failures and inadequate or failed internal processes. Subsequently, the positive impact of reduced operational risk on SCRES has also been confirmed.

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The aim of the paper is to identify and systemise dimensions and measures that can be used to evaluate buyersupplier relational capital (RC). The authors used a literature review methodology composed of the following phases: question formulation, keyword search in databases, screening and analysis of articles. As a result, 44 articles were selected and finally analysed in detail. It was found that several theories can help to explain how buyer-supplier relationships contribute to a company's value and competitive advantage. Furthermore, RC as an element of social capital deserves more investigation in a supply chain management context. Accordingly, to date there has been no relevant in-depth studies exploring the measurement of relational capital in supply chains. On the base of the review of research articles published between 2004 and 2018, the list of items used by researchers to measure the relational capital was explored. Then, authors proposed a construct for relational capital consisting of 5 items such as: trust, close interaction, respect, reciprocity and commitment, that were shortly discussed. Taking them all into account, an authorial definition of supply chain relational capital was proposed. Although, the final results contribute to the study of RC measurement within buyer-supplier relationships in supply chains, the analysis still has some shortcomings that need to be addressed in further literature studies and empirical research.

Summary The growing uncertainty of business environment that negatively influences the contemporary supply chains is one of the major challenges for today’s managers. The literature recommends the development of resistant supply chains, defining them as adaptive and flexible. However, there are a few scientific publications that directly link to the area of Supplier Relationship Management in this regard. The article aims to answer the question what is the flexibility and adaptability and how to perceive these two characteristics in terms of an upstream supply chain. The observations indicate that building relationships resistant to these disruptions with suppliers includes the formulation of appropriate strategies towards both the suppliers and the purchasing process. Their choice depends on the source of uncertainty and the costs of switching the suppliers

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