Portfolio-based Planning: State of the Art, Common Practice and Open Challenges

In recent years the field of automated planning has significantly advanced and several powerful domain-independent planners have been developed. However, none of these systems clearly outperforms all the others in every known benchmark domain. This observation motivated the idea of configuring and exploiting a portfolio of planners to perform better than any individual planner: some recent planning systems based on this idea achieved significantly good results in experimental analysis and International Planning Competitions. Such results let us suppose that future challenges of the Automated Planning community will converge on designing different approaches for combining existing planning algorithms. This paper reviews existing techniques and provides an exhaustive guide to portfolio-based planning. In addition, the paper outlines open issues of existing approaches and highlights possible future evolution of these techniques

On the right track? : evaluation as a tool to guide spatial transitions

Spatial developments are becoming more and more non-linear, dynamic and complex with a wide range of possible actors. The awareness of uncertainty in spatial planning is growing and therefore, projects need to integrate a high level of flexibility. But at the same time, a growing demand for taking more informed and well-argued decisions is noticeable. Predictions out of the ‘best estimated model’ are no longer credible and no longer accepted, because they are too fragile and uncertain. How can we keep these long-lasting, multi-actor projects in permanent transition on the right track? This article presents an evaluation methodology that goes beyond the traditional, rational evaluation attitudes with a low level of flexibility being too linear to match the current spatial developments. There is a need for more interrelated, alert and flexible means of evaluation, co-evolving with the processes and current dynamics in spatial planning. Therefore, different evaluation approaches are introduced, depending on the specific interdependencies of the object of evaluation and its context. Subsequently, the theoretical framework is translated towards a more practical level. A case study conducted in Flanders illustrates the current spatial developments and a possible evaluation approach, incorporated from the beginning of the process, to guide this kind of projects

Giving TESOL change a chance: supporting key players in the curriculum change process

The language of ‘western’ planned and managed TESOL curriculum change aid projects of the 1980–1990s continues to have a strong influence on the terms in which the objectives of 21st century, nationally planned TESOL curriculum change projects are expressed. It is apparently assumed that teachers worldwide will be able to make the cultural and professional adjustments necessary to enable such objectives to be achieved. Many 20th century TESOL aid projects achieved their stated objectives only partially, if at all. The same remains true of much nationally planned and managed TESOL curriculum change today. One important reason for such limited success, is change planners’ failure to adequately consider what support classroom teachers will need, when, and for how long, if they are to be helped to make the above adjustments. This paper does not intend to make value judgements regarding the beliefs about teaching and learning underlying any particular culture, or the classroom behaviours that these give rise to. It represents a pragmatic attempt to present some questions that those responsible for planning TESOL curriculum change might ask, before finally deciding on the objectives of such change in their own contexts. Answers to these questions can, it is suggested, help provide information about how key players (classroom teachers) are likely to experience the implementation of objectives. Based on this information, planners can try to establish systems that will support teachers during the critical first few years of the change process, so making it more likely that the process will ultimately begin to achieve its hoped-for outcomes