Concerning Workload Control and Order Release: The Pre‐Shop Pool Sequencing Decision

Every production planning concept that incorporates controlled order release will initially withhold jobs from the shop floor and create a pre‐shop pool. Order release is a key component of the Workload Control concept that aims to maintain work‐in‐process within limits while ensuring due dates are met. Order release includes two decisions: (i) a sequencing decision that establishes the order in which jobs are considered for release; and, (ii) a selection decision that determines the criteria for choosing jobs for release. While selection has received much research attention, sequencing has been largely neglected. Using simulation, this study uncovers the potential for performance improvement in the sequencing decision and improves our understanding of how order release methods should be designed. Although most prior studies apply time‐oriented sequencing rules and load‐oriented selection rules, analysis reveals that load balancing considerations should also be incorporated in the sequencing decision. But an exclusive focus on load balancing is shown to increase mean tardiness and, paradoxically, require high workloads. A new sequencing rule is developed that only balances loads when multiple orders become urgent. It avoids high mean tardiness and allows the shop to operate at a low workload level. At the same time, the percentage tardy is reduced by up to 50% compared to a purely time‐oriented rule. The findings have implications not only for Workload Control but for any concept that features order release control, such as ConWIP and Drum‐Buffer‐Rope.     

Choices and life chances: feminism and the politics of generational change

The perception that young women are disengaged from feminist politics has provoked a great deal of tension between feminist generations. Recent feminist research into generational change has largely avoided this tension by focusing on the shifting meanings of feminism and the discrepancy between young women's reluctance to identify as “feminists” and their general acceptance of feminist attitudes toward gender issues. Nevertheless, in an era when gender equity goals seem to be if not slipping backwards then lacking urgency, young women are less likely to identify with a collective feminist politics than are older women. Underpinned by the findings of a major study of the attitudes toward work, family, and retirement of three generations of Australian women, this paper develops an approach that helps explain this reluctance. Drawing on the work of Karl Mannheim, the paper suggests that the cultural currents shaping the consciousness of different generations of women impact significantly on gender identity. The implications of this cultural shift are considered in the context of feminist politics and the contemporary “culture wars.”     

Book reviews

Krafft‐ebing: a reconsideration

Step Children of Nature: Krafft‐Ebing, Psychiatry, and the Making of Sexual Identity. By Harry Oosterhuis. Chicago: University of Chicago Press, 2000, 321 pages. Cloth, $30.00.

Love american style

Love and Eroticism. Edited by Mike Featherstone. London: 1999, 425 pages. Paper, $24.95.

Doing the right thing: Three new books on the importance of sex

Male, Female: The Evolution of Human Sex Differences. By David C. Geary. Washington, DC: American Psychological Association, 1998, 410 pages. Cloth, $49.95. Why Sex Matters. By Bobbi Low. Princeton, NJ: Princeton University Press, 1999, 328 pages. Cloth, $29.95. Sex Differences: Developmental and Evolutionary Strategies. By Linda Mealey. San Diego, CA: Academic Press, 2000, 492 pages. Cloth, $79.95.

Courageous, compassionate, and scholarly: An evolutionary analysis of rape and male sexual coercion

A Natural History of Rape: Biological Bases of Sexual Coercion. By Randy Thornhill and Craig T. Palmer. Cambridge, MA: The MIT Press, 2000, 251 pages. Cloth, $28.95.

Deconstructing the discourse of sexual dimorphism: rethinking, bending, and crossing sexual boundaries

Sexing the Body: Gender Politics and the Construction of Sexuality. By Anne Fausto‐Sterling. New York: Basic Books, 2000, 473 pages. Cloth, $35.00.     

Sibling relationships and internalizing symptoms of youth in foster care

Compared to the sibling literature of the general population, little is known about sibling relationships of youth in foster care. The current study aimed to report on sibling relationships among youth in foster care, and investigate the potential protective nature of sibling relationships of those who have experienced trauma on the expression of internalizing symptoms among a nationally representative sample of 152 adolescents in foster care. Results indicated that the large majority of the sample was currently separated from their sibling. Of those who were not living with their sibling, nearly three quarters saw their sibling monthly or less frequently with one third of the sample reporting never having any contact with their sibling. In addition, bootstrapping methods were used to determine if sibling relationships mediated the effect of trauma on internalizing symptoms. Results indicated that a positive sibling relationship significantly mediated this relationship. Implications of these findings are discussed.     

How much culture is enough? Inuit teachers’ perceptions on the state of Inuit culture in Nunavik classrooms

This paper highlights findings of a survey conducted with the Kativik School Board, Canada, to gain insight into the perceptions of Inuit teachers concerning how Inuit culture is taught in the classroom. While findings indicate that teachers are integrating Inuit culture to varying degrees, roughly half of respondents suggest that not enough Inuit culture is being taught. Responses additionally suggest that attempts to articulate culture in schools should consider teachers’ access to cultural knowledge, the creation of effective learning spaces, and the inclusion of community Elders.     

Risk and parenting assessments in child welfare court proceedings – a psychodynamic approach

This article discusses a court directed parenting and risk assessment of a mother who has a chronic history of trauma and abuse. It addresses the complex unconscious dynamics that need to be managed by social workers when working with parents in court proceedings regarding their children. Often such parents present with their own complex histories of trauma and abuse and despite their conscious intentions to do so this has contributed to their inability to provide adequate care for their own children. An understanding of the powerful unconscious processes in operation more effectively gauges the risk factors that such parents present. However, such cases and enactments on behalf of parents can be bewildering to social work practioners. This may potentially lead to the social worker feeling persecuted during the process, resulting in impulsive, unprocessed and poor decision-making despite their best conscious intentions. To mitigate these challenges there is discussion of the support needs required for social workers, who engage with such complex unconscious dynamics.     

Doctoral Study Programs in Social Work at HBCUs: Origin and Program Development

Fisk University began the genesis of HBCU graduate programs in 1880. During the next fifty years, several other HBCUs established graduate programs. That group included Lincoln, Howard, and Morgan State. However, only Lincoln University established a PhD program. The primary goal of this paper is to provide a historical perspective regarding the development of social work doctoral degree programs in the context of HBCU graduate degree program development. Although HBCU social work doctoral programs have only existed since 1978, they are significant and growing academic enterprises which are expanding the pool of doctoral level social work experts and professors of color. Further, these programs should be viewed contextually as producers of scholars on the larger landscape of the academy.     

Card-based production control: a review of the control mechanisms underpinning Kanban,ConWIP, POLCA and COBACABANA systems

Since the emergence of Kanban, there has been much research into card-based control systems. This has included attempts to improve Kanban and/or develop alternative systems, particularly ConWIP (i.e. Constant Work-In-Process), POLCA (i.e. Paired-cell Overlapping Loops of Cards with Authorisation) and COBACABANA (i.e. Control of Balance by Card-Based Navigation). Yet, to date, no unifying review of the mechanisms underpinning these systems has been presented. As a consequence, managers are not provided with sufficient support for choosing an appropriate system for their shop; and researchers lack a clear picture of how the mechanisms compare, leading to several misconceptions. This paper reviews the control mechanisms underpinning the Kanban, ConWIP, POLCA and COBACABANA systems. By comparing the ‘control mechanism’ (i.e. the loop structure and card properties) and ‘contextual factors’ (i.e. routing variability, processing time variability, and whether stations are decoupled by inventory or the flow of jobs is controlled), we provide managers with guidance on which system to choose. For research, we show for example that most criticisms put forward against Kanban systems, e.g. to justify the development of ConWIP, POLCA or COBACABANA, only apply to work-in-process Kanban systems and not to production Kanban systems. Future research directions for each control system are outlined.