We give a summary of recent progress in the field of electronic structure calculations for materials with strong electronic Coulomb correlations. The discussion focuses on developments beyond the by now well established combination of density functional and dynamical mean field theory dubbed “LDA+DMFT”. It is organized around the description of dynamical screening effects in the solid. Indeed, ...

This paper discusses Brooks’ The Mythical Man-Month, a landmark work in the software project management field, and compares the software project management advice given there with practices employed some 25 years later. To find out the state of today’s practice 20 experienced software developers were interviewed regarding their impressions of factors leading to success or failure of software de...

Computer A nalysts frequently describe troubled projects with the tar pit metaphor used so effectively in Fred Brooks’s The Mythical Man-Month (2nd ed., AddisonWesley, Reading, Mass., 1995). We have found a similarly effective metaphor: Think of a troubled software project as an insect caught in a spiderweb of sticky constraints, trying desperately to break free before the spider arrives to feed.

In Situational Method Engineering, the concepts of both fragment and chunk have been proposed as the atomic element. These are examined here in terms of their conceptual integrity and in terms of how they may be used in method construction, drawing parallels to show that the similarities are more than the differences. The new ISO/IEC 24744 standard metamodel is used as a conceptual framework to...

Obtaining the eigenvalues and eigenvectors of large matrices is a key problem in electronic structure theory and many other areas of computational science. The computational effort formally scales as O(N) with the size of the investigated problem, N , and thus often defines the system size limit that practical calculations cannot overcome. In many cases, more than just a small fraction of the p...