This study examines how time spent in problem definition affects problem solving in projects such as Six Sigma projects. Our hypotheses are tested using data collected from 1558 Six Sigma projects in a company. The results show evidence of a U‐shaped relationship between the amount of time spent in the Define phase and project duration. This finding suggests that spending too little time on problem definition potentially causes poor problem formulation, which leads to deficient problem solving and lengthens overall project time. On the other hand, too much time spent on problem definition can lead to unneeded delays in project completion due to diminishing returns on problem definition efforts. Furthermore, the optimal balance between spending too little and too much time depends on prior project experience and project complexity. Prior project experience reduced project completion time and weakened the U‐shaped effect. Conversely, complex projects took longer and appeared to show some evidence of a stronger U‐shaped effect; this suggests balancing the time spent in the Define phase was more challenging for complex projects. Our study also underscores the importance of managing project duration, as projects that were completed faster tended to be associated with higher project savings. 相似文献
The goal of the United Nations International Conference on Population and Development (ICPD), held in Cairo in September 1994,
was to agree on a Programme of Action in the field of population and development which would supersede the Plan of Action
agreed to at Bucharest in 1974 and subsequently amended ten years later in Mexico City. The main purpose of the present paper
is to characterize some of the principal intellectual and ideological developments of the last 20 years which have had an
impact on the definition of this goal. I conclude with some brief comments on the Programme of Action adopted by consensus
at the Conference.
This is an amended version of the paper I presented at the Seventh National Conference of the Australian Population Association
(in a Plenary Session entitled ‘Messages from Cairo’), held in Canberra in September 1994. 相似文献
Books reviewed in this article: John Urry, Sociology beyond societies: mobilities for the twenty‐first century, New York and London: Routledge Nikos Papastergiadis, The turbulence of migration: globalization, deterritorialization and hybridity Stephen Castles and Alastair Davidson, Citizenship and migration: globalization and the politics of belonging相似文献
This paper offers a review of the literature on labour turnover in organizations. Initially, the importance of the subject area is established, as analyses of turnover are outlined and critiqued. This leads to a discussion of the various ways in which turnover and its consequences are measured. The potentially critical impact of turnover behaviour on organizational effectiveness is presented as justification for the need to model turnover, as a precursor to prediction and prevention. Key models from the literature of labour turnover are presented and critiqued. 相似文献
Formalization is constantly being proposed as being of great benefit to business expansion and success. This claim, however, has not been previously tested through a review of the empirical evidence, especially in relation to the large number of women in the developing world that operate in the informal economy. Therefore, the aim of this review is to systematize the current empirical evidence on gender, the informal economy and formalization, using a narrative synthesis of 76 papers. The papers were analysed along three main analytical themes – identity, institutions, and constraints and preferences – highlighting their conceptualization in studies of different academic disciplines – economics, sociology, entrepreneurship and development. The review calls for more accurate accounts of formalization decisions by widening the lens through which formalization decisions are conceptualized. These should take account of the rich contextual and temporal dimensions central to these decisions, and recognize that gender alone is not a sufficient factor in explaining women's choices in the informal economy. The review also highlights limitations in relation to the limited conceptual and empirical evidence on which development priorities such as formalization are set. The authors propose a research agenda centred on the need for conceptual frameworks that are more sensitive towards the multidimensional contexts of women's choices. 相似文献
The claim that high levels of engagement can enhance organizational performance and individual well‐being has not previously been tested through a systematic review of the evidence. To bring coherence to the diffuse body of literature on engagement, the authors conducted a systematic synthesis of narrative evidence involving 214 studies focused on the meaning, antecedents and outcomes of engagement. The authors identified six distinct conceptualizations of engagement, with the field dominated by the Utrecht Group's ‘work engagement’ construct and measure, and by the theorization of engagement within the ‘job demands–resources’ framework. Five groups of factors served as antecedents to engagement: psychological states; job design; leadership; organizational and team factors; and organizational interventions. Engagement was found to be positively associated with individual morale, task performance, extra‐role performance and organizational performance, and the evidence was most robust in relation to task performance. However, there was an over‐reliance on quantitative, cross‐sectional and self‐report studies within the field, which limited claims of causality. To address controversies over the commonly used measures and concepts in the field and gaps in the evidence‐base, the authors set out an agenda for future research that integrates emerging critical sociological perspectives on engagement with the psychological perspectives that currently dominate the field. 相似文献
Motivated by the study of traffic accidents on a road network, we discuss the estimation of the relative risk, the ratio of rates of occurrence of different types of events occurring on a network of lines. Methods developed for two-dimensional spatial point patterns can be adapted to a linear network, but their requirements and performance are very different on a network. Computation is slow and we introduce new techniques to accelerate it. Intensities (occurrence rates) are estimated by kernel smoothing using the heat kernel on the network. The main methodological problem is bandwidth selection. Binary regression methods, such as likelihood cross-validation and least squares cross-validation, perform tolerably well in our simulation experiments, but the Kelsall–Diggle density-ratio cross-validation method does not. We find a theoretical explanation, and propose a modification of the Kelsall–Diggle method which has better performance. The methods are applied to traffic accidents in a regional city, and to protrusions on the dendritic tree of a neuron.
The present study explored the role of context and gender on the association between racial discrimination and adolescents’ outcomes among Black nint 相似文献