Abstract-Enterprise architecture supports a holistic approach used to optimize various activities of a company. Software development companies frequently use a popular agile approach, and the most popular agile methodology is Scrum. A sprint retrospective is a Scrum process which is supposed to enable selfdevelopment and improve communication among team members. Unfortunately, the reality is usually different. The aim of the paper is to identify problems with retrospectives and to use enterprise architecture models to help different stakeholders to understand the problems of agile approach and to find reasons why sometimes it does not meet its goals. Next, the authors try to find solutions for the identified problems on the basis of a persona concept.
This paper presents the performance analysis of interactive Internet systems, for which the time rate of system offer change is comparable to the users interaction time with the system. In this paper such systems class is called Interactive Internet Systems with Dynamically Changing Offers (IISDCO). In IISDCO systems an offer change may cause cancellation of the started but incomplete transactions. The necessity of cancellation can result from the sale of a set of resources (goods sold) which is getting exhausted or whose price has changed. This paper includes a performance analysis of an on-line stock exchange system (sample of IISDCO). For the analysis we used models in the form of Time Coloured Petri Nets (TCPNs). We also reviewed the proposed models on the example of the Internet on-line stock exchange system.
The minimization of the total completion time for asynchronous transmission in distributed systems is discussed. Attention is focused on the problem of message scheduling on part of the sender. Messages to be sent form a queue, and the order in which they are to be sent has to be first established. The methods of scheduling messages, which minimize the factor of the total completion time, are presented herein. The message-scheduling problem becomes considerably complicated when the stream of data transmitted between the sender and the receiver is organized into packets. A scheduling rule, according to which the shortest messages (SPT-Shortest Processing Time) are selected as the first to be sent, has been proven to be appropriate for the proposed model. A heuristic algorithm for scheduling messages with real-time constraints is proposed. The performance of the scheduling algorithm is experimentally evaluated. The results of the study show the possibility of improving the total completion time from a few to ten percent, depending on the characteristics of the sender. Thus, the practicability of the method has been proved.
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