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"I could stand in the middle of Fifth Avenue and shoot somebody and I wouldn't lose any voters. Okay. It's like incredible!" Donald J. Trump, President of the United States, in January 2016 at a campaign rally in Iowa. In light of corporate and political turmoil and subsequent questions raised about leaders' dark sides, this Research Topic is particularly timely. We set out to contribute to theoretical, empirical and methodological advancements, focusing on dark sides of personality, processes, and perceptions, and how they relate to leader-follower relationships. Studies of the dark side of leadership follow a long-standing tradition (Conger, 1990), and initially focused mainly on negative leader traits such as narcissism (Braun, 2017) and leader behaviors such as abusive supervision (Schyns & Schilling, 2013; Tepper, 2007; Tepper, Simon, & Park, 2017; Hogan & Kaiser, 2005). The particular potential for toxicity to unfold at the intersections of leadership and followership has been noted (Padilla, Hogan, & Kaiser, 2007), yet research into this domain remains largely underdeveloped. While followership theories receive increasing attention (Uhl-Bien, Riggio, Lowe, & Carsten, 2014), the potential dark sides of followership or followers' impact on dark-side leaders remain unclear. Deviating from the unidimensional view that leaders are omnipotent and to be blamed for negative outcomes, we seek to place emphasis on the different 'shades' of dark leadership by focusing on how dark leadership can be explained by taking leaders, followers, and their interaction in specific contexts into account. In line with the purpose to explore the intersections between dark-side leadership and followership, we saw three main themes emerging from the articles published in this Research Topic. The first theme revolves around leader traits and behaviors. It focuses on questions such as what makes a 'dark-side' leader and what 'dark-side' leaders do. The second theme accounts for the interaction between leaders' and followers' characteristics, and zooms in on the extent to which this interaction may affect the negative impact of 'dark-side' leadership or followership. Finally, the articles also reflect novel ideas, extensions and integration of current theories at the interface between leadership and followership.

Energie- und Ressourceneffizienz sind Qualitätsmerkmale, die auch für moderne Werkzeugmaschinen gelten. Der Energieverbrauch von Maschinen bis zu gesamten Fertigungsstandorten muss im Verhältnis zur erzielten Wertschöpfung deutlich gesenkt werden, um wettbewerbsfähig zu bleiben und unserer Verantwortung gegenüber der Umwelt zu entsprechen. Dieser Beitrag präsentiert anhand eines Fräsprozesses ein modellgestütztes Simulations- und Prognosesystem des Energieverbrauchs von kompletten Bearbeitungsoperationen auf einer Werkzeugmaschine als Basis energetischer Optimierungen.
 
Resource efficiency and energy consumption are critical quality attributes of modern machine tools. The energy consumption of machine tools, plants and facilities must be significantly reduced relative to the value added in order to stay competitive and fulfil our responsibility towards the environment. This article presents a model-based simulation and prediction system of the expected energy consumption of machine tools executing a given process NC-program as a basis for energetic optimization measures. It is exemplified by milling operations.

Energie- und Ressourceneffizienz beschreiben Qualitätsmerkmale, die auch für moderne Werkzeugmaschinen gelten. Der Energieverbrauch von Maschinen bis zu gesamten Fertigungsstandorten muss im Verhältnis zur erzielten Wertschöpfung deutlich gesenkt werden, um wettbewerbsfähig zu bleiben und unserer Verantwortung gegenüber der Umwelt zu entsprechen. Der Fachbeitrag präsentiert anhand eines Fräsprozesses ein modellgestütztes Simulations- und Prognosesystem des Energieverbrauchs von kompletten Bearbeitungsoperationen auf einer Werkzeugmaschine als Basis energetischer Optimierungen. Teil 1 des Fachaufsatzes ist erschienen in der wt-Ausgabe 1/2-2016 auf den Seiten 60 bis 64.
 
Resource efficiency and energy consumption are critical quality attributes of modern machine tools. The energy consumption of machine tools, plants and facilities must be significantly reduced relative to the value added in order to stay competitive and fulfil our responsibility towards the environment. This article presents a model-based simulation and prediction system of the expected energy consumption of machine tools executing a given process NC-program as a basis for energetic optimization measures. It is exemplified by milling operations.

Am IFU der Universität Stuttgart wurde ein Regelkreis für das Tiefziehen entwickelt, welcher einen regelnden Eingriff in den Tiefziehvorgang während des Hubes erlaubt. Die Umsetzung dieses Regelungskonzeptes erfolgte mittels eines Ziehwerkzeugs, das an eine vereinfachte Geometrie eines PKW-Vorderkotflügels angelehnt ist. Beschrieben werden die messtechnische Ausstattung des Versuchswerkzeugs, der Aufbau des Regelkreises und die Entwicklung der Regelstrategie. Des Weiteren werden die Ergebnisse der Simulation sowie der ersten Versuche dargestellt.
 
At IFU, University of Stuttgart a control loop for deep-drawing process, with control intervention during deep-drawing stroke was developed. The closed-loop control was demonstrated on a fender shaped geometry. Described are the measurement devices, design of the closed-loop and the featured control strategies. Results of simulation and sensitivity analysis are also shown.