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Contamination of the environment by heavy metals is a phenomenon of global importance today. When present in high concentrations in the environment, heavy metals may enter the food chain from soils and result in health hazards. Accumulation in street dust is one major way through which heavy metals may find their way into soils and subsequently living tissues of plants, animals and human beings. In this paper, the magnitude and sources of some heavy metals (Cu, Mn, Fe, Cd, Pb and Zn) in street dust samples in and around Gwagwalada, Nigeria, were assessed.

Street dust samples were collected from 12 sites with and without varying levels of human activities (blacksmithing, motor repair works, metal working and fabrication, vehicular traffic and residential development) in the area and analysed by atomic absorption spectrophotometry to determine the magnitude and sources of accumulation of the above heavy metals in street dust in the study area.

The mean concentrations were found to be 210, 79, 97, 3.9, 120 and 96 μg g⁻¹ respectively, for Pb, Zn, Cu, Cd, Fe and Mn across the various sampling sites. Samples collected from sites with human activities were found to contain concentrations of the metals that are generally higher than those in background areas (without human activities). However, metal working and fabrication, and motor repair works were found to have a stronger influence on the accumulation of the metals in the dust samples than vehicular traffic.

The results indicate that, contrary to what is expected, based on the observations made in several areas by many researchers elsewhere, metal working and fabrication, and motor repair works have a stronger influence on the accumulation of the metals in the dust samples than vehicular traffic in the study area.

Provides information on heavy metal contamination of the environment in an area of Nigeria.

The purpose of this paper is to explore use of the Theory of Constraints (TOC) approach in addressing traffic congestion as the main impediment to improving utility of the land transportation systems. The observed element is a motorway segment with regulated access.

As the literature addressing this topic is rare or nonexistent, this study employs exploratory design, developing tentative theory through the generation of new ideas and assumptions forming grounded picture as a base for further investigation.

The study concludes that the most binding constraint is broken in the third out of the TOC’ five steps and that the improvement in the given segment of the land transportation system is possible to be achieved using this framework.

Although the merits of use of TOC have been considered in other than just production-planning environments, its application in land transportation systems has never been examined. This study presents one of the rare, if not the only attempt to make use of this unique theory that is systematised in the systems management paradigm within the realm of land transportation systems.

This paper seeks to examine the concentration of selected heavy metals (Cr, Pb, Cd, and Ni) in oil‐polluted soils of two communities in Warri, Delta state, Nigeria.

Soil auger samples were collected at a depth of 0‐15 cm from four sites. Two soil samples were collected from two sites observed to have had oil spills and also two samples from two sites without oil spillage. The soil samples were analysed using the UNICAM 969 Atomic Absorption Spectrophotometer to determine the level of concentration of the heavy metals in these sites. Their levels in the oil‐spilled sites are compared with those of the control sites and also with the European community standards.

The results obtained from this study reveal that the concentration of the heavy metals considered were higher in the oil‐spilled sites relative to the control sites. Similarly, when compared with the European community standards, the concentration is said to be quite significant.

The results indicate that the operations of the oil industry in the study area have not been sufficiently accompanied by adequate environmental protection. To safeguard agricultural land in the area and hence human health, there is an urgent need for government to address the incidence of oil spills in this area.

This paper provides information on the contribution of the oil industry in heavy metals contamination in the Niger‐Delta area of Nigeria.

This paper aims to address the main arguments put forward in Grietjie Verhoef’s article and contribute to a wider debate among management scholars on the role of indigenous theories. It challenges the view of African management as illusory and points to the rising support for indigenous theories as indicative of the weakening of the unquestioned dominance of universal theories.

This paper takes a conceptual and critically reflective approach, underpinned by a 360-degree evaluation of pertinent literature and theoretical arguments.

This paper reveals an underlying symmetry and interconnectedness, anchored on a shared communal ethos, among Afrocentric management concepts, specifically Ubuntu, Ekpe and Igbo apprenticeship systems. This symmetry points to an underlying indigenous management theory that begs to be further conceptualised, evidenced and advanced.

This paper affirms Verhoef’s demand for Ubuntu, Ekpe, Igbo apprenticeship system to be more rigorously developed and theoretically coherent and urges scholars to intensify effort towards advancing the conceptual and empirical foundations of African management. Echoing Mahatma Gandhi’s timeless counsel, this paper calls on critics of African management to join the effort to bring about the change they wish to see in African management theorising.

This paper disavows the alleged effort to impose a single “African management” model or perpetuate the “colonial/indigenous” binary divide but equally cautions against an effort to veto scholarly striving for a common identity, to learn from history or not embrace collective amnesia. As examples from the USA and Europe show, diversity, even heterogeneity, needs not to preclude the forging of a commonly shared identity complemented with appropriate sub-identities.

This paper links the African management-centred themes addressed by Verhoef to the wider debate among management scholars about lessening the dominance of universal theories and allowing space for context-resonant indigenous theories. It calls on African management scholars to invest the premium and intensified effort towards building a more robust and coherent body of indigenous theory that will have the capacity and efficacy to inform, explain and advance organisational practice and outcomes across Africa.

The miniscule wireless sensor nodes, engaged in the wide range of applications for its capability of monitoring the physical changes around, requires an improved routing strategy with the befitting sensor node arrangement that plays a vital part in ensuring a completeness of the network coverage.

This paves way for the reduced energy consumption, the enhanced network connections and network longevity. The conventional methods and the evolutionary algorithms developed for arranging of the node ended with the less effectiveness and early convergence with the local optimum respectively.

The paper puts forward the befitting arrangement of the sensor nodes, cluster-head selection and the delayless routing using the ant lion (A-L) optimizer to achieve the substantial coverage, connection, the network-longevity and minimized energy consumption.

The further performance analysis of the proposed system is carried out with the simulation using the network simulator-2 and compared with the genetic algorithm and the particle swarm optimization algorithm to substantiate the competence of the proposed routing method using the ant lion optimization.

Africa is a vast, immensely diverse continent with hundreds of local languages, traditions, values, and cultures that shape the lives of its people. The vast resources available on the continent present numerous opportunities for economic development and prosperity. The preceding chapters in this volume have explored many of these resources, highlighting the importance of indigenous knowledge in driving sustainable business structures across Africa. This chapter concludes with practical recommendations for implementing and sustaining indigenous knowledge on the continent and building a more equitable and sustainable future for Africa. We anticipate that these observations and recommendations will aid African researchers, government and non-governmental organisations, educators, business actors and leaders, legislators, and the general public in thinking globally but acting locally to advance indigenous knowledge in Africa.

Spirituality is a foundational concept within African indigenous communities. Spirituality informs the socio-cultural, political, environmental and economic operating systems within these communities. It is perceived as a strength, but with the systemic debasement of the African indigenous spirituality, many systems informed by spirituality have been impacted in various ways, including the ethno-medical livelihood practices.

This chapter is based on a study that used an exploratory ethnographic case study approach with qualitative methods of data collection to explore the understanding of spirituality and its influence on well-being. The study context is Bomvanaland, in the Eastern Province of South Africa. The people of this area are called ‘amaBomvane’. The study is positioned within the social justice, constructivist interpretivist paradigm, combining Resilience theory (Mertens, 2009) with Ubuntu (an African indigenous framework), which is an African moral philosophical framework, as the influencing frameworks of the study. The study outcomes posit a practice of ethno-medical spirituality that is foundational to the identity and culture of the people who come from this area. This practice is embedded in Ubuntu, supporting resilience and well-being that carry the potential to positively influence their economies.

Within education, the online forum is becoming a preferred mode of study across the globe and the COVID-19 era highlights its importance. Research around online education has concentrated on the USA and Europe, and this study sought to redress the Western bias by exploring and comparing the perceptions of six post-graduate East-African students and lecturers at Pan Africa Christian University in Kenya on learning leadership online versus on-campus. It is debatable whether leaders are born or made; however, post-industrial theories embrace the concept that leadership is teachable. Semi-structured interviews were conducted, recorded, transcribed and thematically analysed, using a top-down approach, from a critical realist perspective. The results show that participants’ leadership ideals synthesised Afrocentric perspectives of communality, with Western ideals of transformational and servant leadership. Furthermore, there are differences between perceptions of East- African students and lecturers on online leadership learning. Students preferred the online avatar experience, whilst lecturers preferred on-campus or blended methods of leadership studies. Face-to-face connection was deemed important by students and lecturers but impeded by the inability to see facial reactions using the current online platform. This exploratory study gives insight into an East-African experience and sends a clear message to Kenyan institutions to invest further in video technology. Future research could include a longitudinal study of destinations and successes of Kenyan University online leadership alumni. The impact of the global coronavirus pandemic, with lockdowns and social distancing, further underlines the importance of ongoing online leadership research and education across the world.

The present study investigates the relationship between servant and authoritarian leadership, and leaders’ third-party conflict behaviors in followers’ conflicts, thereby contributing to integrating knowledge on leadership styles and leaders’ third-party conflict behaviors. This study aims to investigate leadership and conflict management in a context hardly studied: local religious communities or convents within a female religious organization.

The authors collected quantitative survey data from 453 religious sisters, measuring their perception of leaders’ behaviors. These religious sisters live in local religious communities within a Catholic Women Religious Institute based in Nigeria (West Africa) and in other countries across the globe.

Results show that servant leadership relates positively to leaders’ third-party problem-solving behavior and negatively to leaders’ avoiding and forcing. Moreover, authoritarian leadership relates positively to leaders’ third-party avoiding and forcing behaviors.

This study expands theory development and practices on leadership and leaders’ third-party conflict behaviors. The authors associate servant and authoritarian leadership with leaders’ third-party conflict behaviors: avoiding, forcing and problem-solving, in followers’ conflicts. The authors offer practical recommendations for religious leaders on servant leadership and leaders’ third-party conflict behaviors.