Collaborative Planning Approach Research Articles

Examining collaborative planning processes and outcomes in urban regeneration: A deliberative turn in China?

Collaborative planning practices have recently emerged in China to deal with the complexity and conflicts of interest in urban regeneration. Building on the concept of authoritarian deliberation, this study develops a conceptual framework to examine the reasons for initiating collaborative planning, and its processes and outcomes. Through the case study of Guangzhou’s Enning Road micro-regeneration project, this research deepens understanding of collaborative planning in an authoritarian context. It reveals that deliberative methods were used by the local government to mitigate conflicts and improve governance performance in urban regeneration. While deliberations in an authoritarian context met many process criteria of collaborative planning, the collaborative processes had limited influence on planning outcomes. In addition, this study marks the increased level of participation in Chinese urban regeneration and discusses the limitation of deliberative practices in an authoritarian context. Lastly, this study reflects on the adoption of collaborative planning approaches as a state strategy to balance various interests and reinforce its dominance in market-driven urban regeneration, ultimately to achieve goals beyond economic benefits.

THANATOPHORIC DYSPLASIA: Birth, death, and the experience of family support and neonatal palliative care

Tanatophoric dysplasia is a usually lethal genetic syndrome in the perinatal period, which has a significant psychological impact on the pregnant woman and family. It necessitates careful monitoring by the health professionals involved in the care. The objective of this work is to present an experience report on the psychological and multidisciplinary monitoring of a pregnant woman diagnosed with type 2 tanatophoric dysplasia during prenatal screening. The methodology of the present study involves presenting a clinical case with a description of the clinical and psychological conditions of the pregnant woman, along with the interventions carried out by the health professionals involved in the case. The pregnant woman sought psychological care after receiving the diagnosis of type 2 tanatophoric dysplasia. Subsequently, the psychologist coordinated with other health professionals involved in the case and the institution where the delivery would take place, leading to the development of a collaborative planning and management approach. Upon discussion, the pregnant woman and her family opted for palliative care for the newborn. The team of professionals aligned their approach to meet the family’s wishes and needs. The newborn received supportive measures but survived for only a few hours before passing away. The integrated performance of the health team professionals and the flexibility of the hospital institution allowed the adequate planning of care actions and facilitated a positive reception experience for the family. This case highlights the importance of psychological support, individualized planning, and the relevance of teamwork in providing comprehensive care during such challenging circumstances.

Planning of wind-photovoltaic-storage-hydrogen-water for a zero-carbon microgrid on an independent island

Due to low daily demand and the remote location from the shoreline, diesel generators dominate the energy supply on these islands, resulting in significant emissions of harmful gases. In this paper, a collaborative planning approach is proposed for a zero-carbon microgrid incorporating wind turbines (WTs), photovoltaic modules (PVs), electrochemical energy storages(EESs), hydrogen energy storages(HESs), and sea water desalination on an independent island. Long-term and short-term energy storage mechanisms, represented by HESs and EESs, respectively, are coordinated to harness the abundant wind and solar energy resources. Additionally, consideration is given to the requirement for sea water desalination to achieve a self-sustained equilibrium of zero-carbon water and electricity for the island’s inhabitants. Illustrative analysis demonstrates that the proposed planning method accounts for the stability and environmental preservation in terms of the planning and operation. This has profound implications for advancing the transformation of the island’s microgrid energy infrastructure, enhancing the utilization of renewable energy, and bolstering the self-sustaining capacity of hydropower resources.

A two-stage stochastic collaborative planning approach for data centers and distribution network incorporating demand response and multivariate uncertainties

As a critical infrastructure to support the development of digital economy, the scale of data center (DC) power consumption has been growing continuously in recent years. The plug-in of a large number of DCs to the distribution network (DN) presents both opportunities and challenges for the secure, stable, and sustainable operation of the system. In order to address the planning issues arising from the integration of DCs into the DN, this paper proposes a two-stage (planning stage and operation stage) collaborative planning method for DCs and the DN while considering the source-demand uncertainty. Firstly, spatial-temporal demand response characteristic of DCs is explicitly elaborated, and based on the energy consumption model, a two-stage stochastic planning model considering conditional value at risk (CVaR) for DCs and the DN is constructed using probabilistic stochastic simulation, which obeys low-carbon and security, and satisfies the source-network-load constraints of the system. The siting and sizing for DCs and renewable generation, feeder expansion for the DN are determined to minimize the investment cost during the planning stage, while the power output for the devices considering uncertainties from load and renewable energy are optimized to minimize the operation cost during the operation stage. Secondly, the L-shaped decomposition algorithm is proposed to solve the two-stage stochastic optimization problem by reconstructing the problem into a master problem and subproblems, where the dual multiplies are calculated to generate feasibility cuts and optimality cuts to achieve iterative solving. Finally, numerical case studies on a 33-bus distribution system demonstrate that the participation of DCs in demand response can achieve a significant reduction in the investment and operation cost of the DN, and further promote the consumption of distributed renewable energy sources.

Multiple super-agile satellite collaborative mission planning for area target imaging

Collaboration between multiple super-agile satellites with dynamic imaging capabilities provides an opportunity for highly efficient observation of large-area targets. Reasonable allocation of multi-satellite resources and determination of the action sequences of each satellite are two key requirements for multiple super-agile satellite mission planning. We propose a multi-satellite collaborative mission planning approach for an area target imaging mission, considering the dynamic imaging characteristics, achieving integrated optimization of the allocation of multi-satellite resources and determination of the action sequences of each satellite. A multi-satellite mission planning model with two objectives was established, with the objective functions being to maximize the observation coverage revenue and minimize the task performance time. An improved particle swarm optimization algorithm, represented by introducing particle learning/selection strategies and variable type-adaptive position updating methods, addresses the discrete–continuous hybrid variables in this optimization model. The proposed method was verified by constructing three groups of comparative experiments with area targets of different sizes. The proposed method showed consistent adaptability to various complexities and achieved synchronous optimization of the allocation of multi-satellite resources and determination of the action sequence of each satellite in areas of different sizes. Compared with existing algorithms, the proposed algorithm obtained superior imaging mission schemes with lower computational consumption, higher observation coverage revenues, or shorter task performance time. The experimental results showed that the proposed multi-satellite collaborative mission planning approach could be used to the ground operational systems of super-agile satellite constellations.

Collaborative planning for intermodal transport with eco-label preferences

Sustainability is a common concern in intermodal transport. Collaboration among carriers may help in reducing emissions. In this context, this work establishes a collaborative planning model for intermodal transport and uses eco-labels (a series of different levels of emission ranges) to reflect shippers’ sustainability preferences. A mathematical model and an Adaptive Large Neighborhood Search heuristic are proposed for intermodal transport planning of carriers and fuzzy set theory is used to model the preferences towards eco-labels. For multiple carriers, centralized, auction-based collaborative, and non-collaborative planning approaches are proposed and compared. Real data from barge, train and truck carriers in the European Rhine-Alpine corridor is used for extensive experiments where both unimodal carrier collaboration and intermodal carrier collaboration are analyzed. Compared with non-collaborative planning without eco-labels, the number of served requests increases and emissions decrease significantly in the collaborative planning with eco-labels as transport capacity is better utilized. • A conceptual framework for collaborative planning of intermodal transport is proposed. • The eco-label preferences are taken into account to achieve sustainable intermodal transport. • The centralized approach, auction-based collaborative approach, and non-collaborative approaches are proposed and evaluated comparatively. • Two scenarios of collaborative planning, i.e., collaboration among unimodal carriers and collaboration among intermodal carriers, are considered. • Realistic transport networks in the European Rhine-Alpine corridor are used to conduct extensive experiments.

AGRI-FOOD SUPPLY CHAIN HOLISTIC DESIGN: TOMATO PRODUCT APPLICATION

Geleneksel tarım-gıda tedarik zincirlerinde ürüne değer katmayan birden fazla aşama olup ürünlerin kalitesini ve fiyatını olumsuz yönde etkilemektedir. Ayrıca tarım-gıda ürünlerindeki enflasyon Tüketici Fiyat Endeksini de doğrudan etkilediğinden zincir üzerinde yapılacak iyileştirmelerin nihai tüketiciye katkısı yüksek olacaktır. Bu çalışma kapsamında tarım-gıda tedarik zincirinde değer yaratmayan katmanların olmadığı ve bütünleşik bir yaklaşımla iş birliğine dayalı bir metodoloji geliştirilmiştir. İlk aşamada ilgili paydaşlar sisteme kabulü ve operasyon süreçleri için Analitik Hiyerarşi Süreci (Analytic Hierarchy Process-AHP) yöntemi ile ayrı ayrı değerlendirilmiştir. Daha sonra Ortaklaşa Planlama, Tahmin ve İkmal (Collaborative Planning, Forecasting and Replenishment- CPFR) yaklaşımı çerçevesinde; doğrusal programlama yöntemiyle en uygun tedarik zincirleri belirlenerek kapasite dengelemesi yapılmıştır. Çalışmanın son kısmında ise metodoloji kapsamında kullanılan yöntemlerin doğrulanmasını gerçekleştirmek üzere domates ürünü üzerine bir uygulama AIMMS modelleme paketi üzerinde analiz edilmiş̧, elde edilen bulgular ve sonuçlar verilmiştir.

Community Participation Strategy for Sustainable Urban Regeneration in Xiamen, China

Urban regeneration is an important strategic choice in promoting urban development globally. Existing research on urban regeneration mainly focuses on the community’s economic benefits. However, less research concentrates on how community participation contributes to the sustainable development of communities. The aim of this study is to explore the community regeneration approach in the context of urban regeneration in a typical village community in China. This study finds that participatory planning, which is mainly characterized by public participation, can be an effective way of communication and cooperation. The collaborative workshops provide a participatory platform for stakeholders and promote sustainable community development. Therefore, traditional planning approaches may need to be changed. The contribution of this article is to develop a collaborative planning approach for sustainable community development, which can serve as a reference for community governance in China and other developing countries.

The nature-based solutions planning support system: A playground for site and solution prioritization

• NBS co-planning needs an integrated assessment of site and solution suitability. • An NBS planning support system (NBS-PSS) is developed and tested in a Dutch city. • NBS-PSS provides an integrated multiscale hierarchical approach for co-planning. • NBS-PSS helps to maximize NBS benefits, while considering local contexts. Cities are increasingly adopting Nature-Based Solutions (NBS) to address multiple societal challenges effectively. Successful adoption of NBS and realization of their multifunctionality requires a holistic and collaborative planning approach that incorporates stakeholders across scales and disciplines. However, such an approach is usually not aligned with the mainstream sectoral planning process in cities. Planning support systems (PSS) play an essential role in the transition to collaborative planning. Current systems used for NBS planning tend to be highly specialized, focusing on a few ecosystem services and a single scale. As a response, the NBS-PSS is introduced. This system's novel multiscale hierarchical framework helps stakeholders to prioritize sites and solutions in an integrative manner. The NBS-PSS provides the flexibility needed for NBS planning and allows users to interact and iterate over different planning process stages. The system has been tested in the city of Eindhoven with a group of experts. Accordingly, the system appears to have a high capacity to facilitate collaboration and motivate stakeholders to engage in the planning process, given the rapid responses and easy-to-understand process and data representation. Moreover, the NBS-PSS was found to be a helpful tool for enhancing the awareness of opportunities for NBS in urban settings.

Sustainable Mobility and Resilient Urban Spaces in the United Kingdom. Practices and Proposals

The development of integrated and multi-scalar regeneration strategies focused on public space and involving innovated mobility, environmental and historic networks is a key issue of international references and an actual challenge of pandemic and social distancing measures. The innovation of urban planning and design toward multi-scalar and integrated methodological and operational references is the topic of a research and didactic path carried out at Sapienza University, focused on the regeneration of infrastructure and public space networks. In this framework, United Kingdom represents an interesting field of study for the conditions that have recently led to an efficient cooperation model among local authorities, aimed at achieving sustainable common goals. A shared territorial governance that promotes the integrated management of soil, water and biological resources from an eco-systemic perspective. A collaborative planning approach based on a responsible, inclusive and sustainable strategy for the construction and networking of new resilient urban spaces, green infrastructures and new forms of sustainable mobility. The networking of green spaces, waterfronts and cycle paths represent a resilient response to cities’ regeneration for the contribution provided by ecosystem services in increasing health and well-being and a greater adaptability to climate change. The paper aims to illustrate the main methodological and operational references, case studies and results of the research and didactic path focused on multiscalarity and integration of planning and projects through the design of public space along blue and green networks in the United Kingdom. Key concepts that link together the phases of contextualization of the national planning background, the analysis of ongoing regeneration practices on waterfronts and the experimentation related to a regeneration proposal for King’s Lynn, in Norfolk County (England). Research and practices that integrate green, blue and grey infrastructures addressing the UN Agenda 2030 and the National Planning Policy Framework of England.

Stakeholder Perceptions of Nature-Based Solutions and Their Collaborative Co-Design and Implementation Processes in Rural Mountain Areas—A Case Study From PHUSICOS

Planners and engineers increasingly discovered nature as a source of inspiration to mitigate hydro-meteorological risks resulting from extreme weather events. Actors are realizing advantages of such solutions known as Nature-Based Solutions (NBS) to rapidly adapt to changing climate patterns and related impacts such as flooding, landslides, mudflows or rockfalls. NBS also provide multiple co-benefits such as an increased landscape value for society and biodiversity. Because of their inherent characteristics, NBS implementation are more efficient when supported by participative approaches. At the same time, strengthening democratic and collaborative planning into Living Labs approaches generates an increase in interest. This helps to overcome bottlenecks when implementing measures and provide common ground to provide space for new ideas, to promote innovation and to develop solutions with high acceptance. While co-design and implementing NBS has already been applied and well documented for urban areas, there are few publications on collaborative planning, stakeholder perception and NBS co-implementation in rural mountain areas. In our case study analysis from the EU-funded H2020 project PUSICOS, we present stakeholder views on NBS, their possibility to reduce natural hazards in different mountainous case study areas, different discussed measures, NBS types and stages of implementation. We analyze expectations on Living Lab processes to co-design NBS and important topics to be addressed in these processes from the view, perspective and perception of local stakeholders. Despite the importance of NBS on political and research agenda, in both the literature and the interviews, the concept and ideas are less familiar to stakeholders. NBS are mainly encountered within river restoration measures. The main interest was to reduce risks and to find solutions that were attractive and interesting also from an economical point of view e.g. business models for farmers and landowners and less of the multiple benefits that are most important for stakeholders in urban areas. The collaborative planning approach was seen as important for engaging stakeholders and creating knowledge about NBS. These insights will contribute to the understanding and address the management of intense stakeholder involvement processes, identify barriers that arise, and support in-depth participatory processes.

A five-step drone collaborative planning approach for the management of distributed spatial events and vehicle notification using multi-agent systems and firefly algorithms

In spite of the performance that existing approaches for drone collaborative planning have demonstrated, there is still a need for new solutions which are capable of effectively identifying the right tasks for the right drones at the right times while maximizing the total benefits obtained from the drones’ actions. These new solutions should be particularly tested within the context of intelligent transportation systems to assess their impact on mobility and traffic flow. In order to address these issues, we present in this paper a new a five-step solution for drone collaborative planning. Our solution uses a Multi-Agent System as well as a Firefly Algorithm solution to enable drones jointly neutralize ongoing events by considering trust factors and cost/benefit analysis. The solution, which is also capable of issuing appropriate warnings to vehicles to prevent them from incurring any undesirable/dangerous impact due to ongoing events, is using a reward-driven competition to encourage drones to join collaborating teams. Our simulations are showing promising results in terms of processing time, energy consumption, and total reward obtained compared to two other planning approaches relaying on random and priority-based selection of the next locations that drones will visit respectively.

A collaborative approach in tourism planning: The case of Tuscany region

Community collaboration and participation are necessary to strengthen the effectiveness of tourism policy. This article aims to examine the tourism planning activity of public administration in fostering a collaborative approach. The article contributes to the debate on collaborative approach in tourism from the perspective of public administration. The research uses a case study and examines how Tuscany region applies a collaborative tourism planning approach using the Habermasian framework. Results underline the fundamental role of local government can be strengthened by an extensive stakeholder engagement process able to encourage broad representation and trust of stakeholder interest about public policies. Moreover, the collaborative approach by mixing the different point of view of stakeholders, produces a range of positive outcomes and increases the efficacy of tourism policies. However, the realization of the “ideal speech situation” is very difficult and may be undermined by the threatens highlighted in the study, such as the lack of financial resources, the claim to more homogeneous policies to increase tourism trends, the need to improve trust and collaboration between public and private, the difficulties in maintaining high level of attention and the widespread scepticism about the capability of public entities to understand priorities in defining tourism policies.

Achieving Sustainable Nitrogen Management in Mixed Farming Landscapes Based on Collaborative Planning

Regulation of nitrogen (N) loss from the agri-environment is a global challenge with dire consequences for food production and environmental management. This is also the case in Denmark where regulation largely relies on general measures for reducing N inputs. These measures have significantly reduced nitrogen emissions, but further reduction is needed to achieve sustainable low levels of N transport to freshwater and marine ecosystems in compliance with standards set by the EU Water Framework Directive. As an alternative to general regulation, we tested a watershed-based, collaborative planning approach, engaging stakeholders in solution identification. Six watersheds with substantial agricultural production were used as test areas. A collaborative planning process of two stakeholder workshops embedded within a scenario formulation process was executed. Stakeholder inputs about possible, desirable and sustainable futures were used to formulate scenarios, for which N reduction effects were calculated. Upon conclusion of this process, results were assessed using a structured evaluation method. Results indicate that the process we tested was successful in terms of (1) engaging relevant stakeholders, (2) providing relevant data, (3) achieving processual flexibility, (4) including local knowledge and (5) facilitating a creative and explorative process. On this basis, suggestions for improving collaborative planning processes are provided.

Sustainable Spatial Energy Planning of Large-Scale Wind and PV Farms in Israel: A Collaborative and Participatory Planning Approach

In this work, an innovative sustainable spatial energy planning framework is developed on national scale for identifying and prioritizing appropriate, technically and economically feasible, environmentally sustainable as well as socially acceptable sites for the siting of large-scale onshore Wind Farms (WFs) and Photovoltaic Farms (PVFs) in Israel. The proposed holistic framework consists of distinctive steps allocated in two successive modules (the Planning and the Field Investigation module), and it covers all relevant dimensions of a sustainable siting analysis (economic, social, and environmental). It advances a collaborative and participatory planning approach by combining spatial planning tools (Geographic Information Systems (GIS)) and multi-criteria decision-making methods (e.g., Analytical Hierarchy Process (AHP)) with versatile participatory planning techniques in order to consider the opinion of three different participatory groups (public, experts, and renewable energy planners) within the site-selection processes. Moreover, it facilitates verification of GIS results by conducting appropriate field observations. Sites of high suitability, accepted by all participatory groups and field verified, form the final outcome of the proposed framework. The results illustrate the existence of high suitable sites for large-scale WFs’ and PVFs’ siting and, thus, the potential deployment of such projects towards the fulfillment of the Israeli energy targets in the near future.

Pre-season fire management planning: the use of Potential Operational Delineations to prepare for wildland fire events

US fire scientists are developing Potential Wildfire Operational Delineations, also known as ‘PODs’, as a pre-fire season planning tool to promote safe and effective wildland fire response, strengthen risk management approaches in fire management and better align fire management objectives. PODs are a collaborative planning approach based on spatial analytics to identify potential wildfire control lines and assess the desirability of fire before ignition. They offer the opportunity to apply risk management principles with partners before the compressed timeframe of incident response. We sought to understand the potential utility of PODs and factors that may affect their use through semistructured interviews with personnel on several national forests. Interviewees said PODs offer a promising shift in the wildland fire management dynamic, particularly by facilitating proactive communication and coordination about wildfire response. Successfully employing PODs will require leadership commitment, stakeholder and partner engagement and interdisciplinary staff involvement. Our work offers insights for national forests and other jurisdictions where managers are looking to strengthen coordination and strategic approaches for wildland fire response by utilising pre-season collaboration and data analytics.

Collaborative Urban Land Use Planning in Wat Ket, Chiang Mai, Thailand

The official approach to urban planning in Thailand involves a centralized process that relies mainly on decisions from the national government. This approach has not been effective in a small and unique area like Wat Ket in Chiang Mai City in northern Thailand which has a variety of different land use types. Some land use areas in the Wat Ket area were designated as commercial zones, without the involvement and agreement of local residents and this led to land use conflicts and other related problems. This paper describes how stakeholders in Wat Ket applied an alternative collaborative approach to urban land use planning. The paper provides a case study of the collaborative urban planning approach in the context of a rapidly growing city in the developing world.Collaborative urban land use planning is supported by land use analysis applying aerial photographs and Geographical Information Systems (GIS) to analyse land use changes in the study area.

A Community-Based Emergency Response Management in Pasir Gudang, Johor: Theoretical Framework

Community-based emergency response management refers to a collaborative planning and engagement approach, which is designed to support communities and organizations in developing a safer, more resilient and sustainable future. That being mentioned, this study looked into the theoretical bases and practices in light of emergency response, apart from determining the functions of the community in line with emergency response. The primary goal of this study is to build a theoretical framework that enhances the functions of the community in times of emergency response. The mixed-method approach was adopted for data collection. The qualitative approach via interviews had been performed with organization and industry experts in Pasir Gudang, while the quantitative method was employed for the residents in Pasir Gudang. The theoretical framework embeds six elements of emergency response for the community to improve its emergency management. The identified community-based functions seemed to lack in activities, action, function, technique, knowledge, and skill. The proposed theoretical framework is bound to aid the management to comprehend the essence of community-based emergency response and to implement viable strategies in times of emergency.

The art of underperforming SEA – Symptomatic narratives from Germany

SEA spread around the world as has SEA effectiveness research. International SEA evaluations show mixed findings on SEA effectiveness. In this article, the quality and procedural effectiveness of SEA in Germany is analysed pursuing the hypothesis that SEA is influenced by planning and administrative traditions that tend to counteract to more ambitious SEA approaches. Three SEA case studies were analysed according to a set of criteria and indicators based on international research outcomes involving SEA integration into decision-making, scoping, selection and assessment of alternatives, cumulative effects assessment, tiering, public participation, and monitoring. The analysis draws on documents analysis and interviews with representatives from responsible agencies and involved SEA consultancies.The analysis shows that SEA is facilitating informed decision-making as the responsible agencies used the SEA, the interaction with consultancies, and the participation processes as a source of information. However, the case studies show various degrees of SEA quality in Germany based on the evaluated criteria and indicators. Results demonstrate that procedural effectiveness is limited. Unclear legal regulations, an expert-based planning approach instead of a collaborative approach, and organisational constraints limit the SEA quality. Furthermore, SEA performance is highly influenced by administrations' legalistic tradition, the expert-based planning culture, the home-grown planning system, and the bounded importance of SEA consultancies in the era of staff cuts and under-resourced agencies. Thus, the recommendations aim to strengthen a more collaborative planning approach, to build SEA capacity within SEA responsible agencies, and to clarify SEA regulations.The overall question for SEA evaluation research and practice may be how more collaborative planning approaches can effectively be implemented in planning and SEA practice through institutional learning.

Conclusions

To design for the purpose of planning was not new when regional design emerged as a distinguished discipline in the 1980s in the Netherlands. On the contrary, to imagine solutions for particular areas and to discuss these for the purpose of planning has been a long-standing tradition that can be traced back to the emergence of urban planning in the early 20th century. However, when spatial planning emerged as a new, more collaborative and anticipatory planning approach in the last decades, expectations concerning performances of design in planning decision-making increased. Design came to be seen as a practice that not only improves the spatial and technical quality of plans, but also enhances planning innovation, clarifies political agendas, forges societal alliances and raises the efficiency of planning through timely consideration of conflicts that planning may cause in societal and political domains. Since the 1990s, regional design underwent a process of institutionalisation in Dutch national planning. The practice became repetitively used and was formally embedded in planning procedures. Despite more varied expectations and institutionalisation, interrelations between regional design and spatial planning are not well understood. As a result, the performances of regional design are difficult to predict and consequently, often disappointing. Therefore, this research has sought to conceptualize interrelations between regional design and spatial planning. It aimed at an enhanced explanation and prediction of performances. The main research question was: how do the interrelations between regional design and spatial planning influence the performances of regional design? Answers to this question were sought through case-study research. During two consecutive rounds of exploration, two perspectives were taken. During a first in-depth case-study, key performances of regional design were analysed. During a second multiple case-studies analysis, the contextual determinants of these performances were investigated. Detailed results of this dissertation are embodied in Chapter 3 to 7 of this publication. Below, these outcomes are summarised in order to form one coherent line of argument. Theoretical notions, which were considered during the research but were not mentioned in earlier publications of the chapters in the form of journal articles and book chapters, are added. The chapter also contains a critical reflection on the research approaches that were used. A dedicated section summarises the implications of findings for future research.