Useless actions and work in software development projects do not increase the value for the customer. While getting rid of such waste may sound simple, even recognizing the waste is considered a challenging issue. Once recognized with its causes, projects are more aware of the signs of waste: the pitfalls are avoidable by knowing their reasons. On the other hand, self-organization and empowerin...

We present the application of software process modeling and simulation using an agent-based approach to a real case study of software maintenance. The original process used PSP/TSP; it spent a large amount of time estimating in advance maintenance requests, and needed to be greatly improved. To this purpose, a Kanban system was successfully implemented, that demonstrated to be able to substanti...

We developed an event-driven simulator of the Kanban process a WIP limited pull system visualized by the Kanban board. WIP(work in process) represent the capacity in the activity to perform features simoultaneously. The simulator is fully object-oriented, and its design model reflects the objects of the Lean software development domain. We used this simulator to assess comparatively WIP-limited...

This paper is concerned with near-optimal control of manufacturing systems consisting of two unreliable machines in tandem and having the objective of minimizing the total discounted cost of inventories/shortages over an innnite horizon. Asymptotic optimal feedback controls are constructed with respect to the rate of machine breakdown/repair as compared to the given discount rate. Performance o...

With the emergence of Just-in-Time manufacturing, production control mechanisms that react rapidly to actual occurrences of demand are gaining importance. Several pull type control mechanisms have been proposed to date, but it is usually di$cult to quantify how good these mechanisms are, as well as understanding the structural properties that make them desirable. By using a two stage model and ...

There exists controversy on the superiority of logistics control systems. In this paper, we propose a unified framework for analyzing and comparing of production control mechanisms. KANBAN, CONWIP and Base-stock control systems are focused on and analyzed as three well-known examples of production control systems. The periodic behavior of a token transaction system is used. By using the theory ...

Material control schemes can be classified as push, pull, or hybrid strategies. This paper compares the performance of MRP (push) and kanban (pull) for a multi-stage, multiproduct manufacturing system. Using simulation experiments we analyze system performance under different product mixes and observe that in certain environments with advance demand information kanban-based pull strategies can ...

The main objective of this paper is to use simulation to study the performance of a typic:al multistage multi/ine (MSMP) pull production system having failure prone• machines, we studied the effect of the following pmduction control strategies/mechanisms namely, Independent Extended Kanban Control System (IEKCS), Simultaneous Extended Kanban Control System (SEKCS). Constant WIP (CONWIP). Hybrid...

We analyse an assembly system fed by components produced by suppliers and operating under a pull system with random processing times. Under certain assumptions we present a performance evaluation algorithm which is based on physical decomposition of the network and use of an aggregation/disaggregation algorithm. We consider two important performance measures: system throughput and work-in-proce...