Control charts for monitoring of process variance are developed based on Shewhart, exponentially weighted moving average (EWMA) and cumulative sum (CUSUM) control charts for mean. In all these variance control charts, log transformation of the sample variance is used. The design procedure of this chart is complex and it is poorly understood by the industry. In this paper a EWMA chart for monito...

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This paper provides an empirical investigation into the relationship between ex ante U.S. labor contract durations and uncertainty over the period 1970 to 1995. We construct measures of inflation uncertainty as well as aggregate nominal and real uncertainty. The results not only corroborate previous findings of an inverse relationship between contract duration and inflation uncertainty, but als...

In order to cope with the rapid changes in the world, enterprises utilize project management methodology to globally outsource their works and to evaluate their internal and external work performance. Of all the project management techniques, Earned Value Management (EVM) is the major one that provides a method to evaluate project performance by integrating schedule and cost of work packages. E...

In construction industry, the term ‘procurement’ is considered as a project based job where clients and contractors are always keen to observe performance indicators. These indicators represent financial and non-financial efficiency of project activities. Among these, the monitoring of financial indicators is an important function of project management. Therefore, during the construction phase,...

Different statistical process control (SPC) approaches were proposed over the years for project management using earned value management/ earned schedule. A detailed examination of these approaches has led us to express a need for a unified framework in which to test and compare them. The main drivers for this need were the lack of a formal definition for a state of control, the unavailability ...

Tantangan terbesar yang ada pada industri proyek konstruksi adalah menjaga kualitas mutu, biaya dan waktu konstruksi. Kegiatan sangat dipengaruhi oleh sistem penjadwalan durasi proyek. Sebagian tidak mampu mengatasi tantangan tersebut karena kurangnya kontrol evaluasi Salah satu tindakan korektif untuk dengan melakukan perubahan kontrak Penelitian ini mengimplementasikan Earned Value Method (EV...

The paper gives a systematic way for the development of hybrid control systems, i.e. to reene speciications written in DC (Duration Calculus) into automata models. Firstly, DC formulas are extended with iteration form and a technique for deriving plant automata from DC formulas is presented. Then, a speciication of control automata can be synthesized from plant automata with respect to requirem...