Everyone knows that the waterfall life cycle model suffers from a number of problems but in spite of this, it continues to be the most widely used life cycle model. This paper argues that many of these problems stem from project management best practices that are inappropriately applied in the waterfall model. A different life cycle approach is proposed that emphasise the product life cycle rat...

The traditional waterfall life cycle has been the mainstay for software developers for many years. For software products that do not change very much once they are specified, the waterfall model is still viable. However, for software products that have their feature sets redefined during development because of user feedback and other factors, the traditional waterfall model is no longer appropr...

Agile methods have emerged and become popular over last few years as a response to shortcomings of the waterfall process model. However, agile processes are stamped by some as chaotic processes and are placed in opposition to waterfall approaches. This paper uses the edge of chaos concept from complex adaptive systems theory as a theoretical lens to analyse the roles of structure and planning i...

Waterfalls as sources of small charged aerosol particles L. Laakso, A. Hirsikko, T. Grönholm, M. Kulmala, A. Luts, and T.-E. Parts Department of Physical Sciences, P.O. Box 64, 00014 University of Helsinki, Finland Institute of Environmental Physics, University of Tarto, Ülikooli 18, 50090, Tarto, Estonia Received: 22 June 2006 – Accepted: 31 August 2006 – Published: 26 September 2006 Correspon...

The coronary circulation of anesthetized dogs was tested for the presence of vascular waterfalls by manipulating coronary arterial and coronary venous pressures. The left main coronary artery and the coronary sinus were cannulated, and relationships between coronary artery pressure, coronary sinus pressure, and coronary flow were studied. Experiments were conducted during diastolic arrests, und...

The applicability of the waterfall model was tested using the Starling resistor and different viscosities of fluids to vary the Reynolds number. The waterfall model proved adequate to describe flow in the Starling resistor model only at very low Reynolds numbers (Reynolds number less than 1). Blood flow characterized by such low Reynolds numbers occurs only in the microvasculature. Thus, it is ...

We propose a hybrid inflation model with a complex waterfall field which contains an interaction term that breaks the U(1) global symmetry associated with the waterfall field charge. We show that the asymmetric evolution of the real and imaginary parts of the complex field during the phase transition at the end of inflation translates into a charge asymmetry. The latter strongly depends on the ...

BACKGROUND "Waterfall plots" are used to describe changes in tumor size observed in clinical studies. Here we assess criteria for generation of waterfall plots and the impact of measurement error in generating them. METHODS We reviewed published waterfall plots to investigate variability in criteria used to define them. We then compared waterfall plots generated by different observers for 24 ...

The waterfall transform is a hierarchical segmentation technique based on the watershed transform from the field of mathematical morphology. Watershedbased techniques are useful in numerous fields ranging from image segmentation to cell-and-portal generation for games. The waterfall helps mitigate the problem of over-segmentation that commonly occurs when applying the basic watershed transform....

The need for a formal development structure to produce high quality software products was addressed in 1970 when Royce described the initial software lifecycle model, the now classic Waterfall model. Building on the initial Stepwise model, the Waterfall model was to be re-introduced in a landmark article1, giving it a world-wide audience and adopting it as the conventional lifecycle model. The ...