Parental substance misuse and child protection in a British sample. A survey of children on the child protection register in an inner London district office

The relationship between parental misuse of alcohol and/or illegal drugs and child maltreatment has received considerable attention in the USA, while comparatively few British studies have been published. In both countries, research suggests that it is a large and growing problem and that it has a significant negative impact on children. This study looks at 50 families with 95 children on the Child Protection Register (CPR) in an inner London area through an examination of files and social workers' rating of parental substance misuse as a child protection concern. Parental substance use, as defined by social workers, was considered by social workers to be a cause for concern in 52% of families. Alcohol (in 24% of families) and heroin (in 16%) were the main substances of concern. Substance misuse was strongly related to neglect and cases were twice as likely to be subject to care proceedings. Very little involvement of substance misuse professionals in child protection procedures was found. Different profiles of social work concern were found for alcohol and for illegal drugs. Reasons for this difference and areas for further research are discussed. Copyright © 2000 John Wiley & Sons, Ltd.     

How are policies implemented in children's services? Developing an initial programme theory to evaluate the implementation of the new Child Sexual Exploitation guidance in Wales

Although children's social care is an area rich in guidance, there is very little research looking at the implementation of new policies in the United Kingdom. In this article, we report on the first stage of a realist evaluation of the implementation of the new Safeguarding Children from Child Sexual Exploitation guidance in Wales. We discuss the development of an initial programme theory, for which we conducted semi-structured interviews with practitioners and managers in three local authorities. We developed programme theories across three areas: policy nature and development, implementation plans and organizational context. Findings suggest that, for policies to produce a significant impact on practice, they need to be sufficiently different to social workers' current perceptions of practice. Second, we found that the coordination between national and local policies is critical for successful implementation as contradictions between them might lead to confusion in what local teams should prioritize. Finally, our findings highlight the importance of effective communication of policy changes, as well as a supportive organizational culture to strengthen implementation in local contexts. These findings illustrate the complexity of policy implementation and the need for policymakers to consider the meaningful involvement of local practitioners in national policy development.     

Strengthening a linear reformulation of the 0-1 cubic knapsack problem via variable reordering

The 0-1 cubic knapsack problem (CKP), a generalization of the classical 0-1 quadratic knapsack problem, is an extremely challenging NP-hard combinatorial optimization problem. An effective exact solution strategy for the CKP is to reformulate the nonlinear problem into an equivalent linear form that can then be solved using a standard mixed-integer programming solver. We consider a classical linearization method and propose a variant of a more recent technique for linearizing 0-1 cubic programs applied to the CKP. Using a variable reordering strategy, we show how to improve the strength of the linear programming relaxation of our proposed reformulation, which ultimately leads to reduced overall solution times. In addition, we develop a simple heuristic method for obtaining good-quality CKP solutions that can be used to provide a warm start to the solver. Computational tests demonstrate the effectiveness of both our variable reordering strategy and heuristic method.