The cover from our first issue -- January 2003!

The cover from our first issue -- January 2003!

MeasureIT  is a CMG’s free monthly newsletter, published 10 times per year. Written by and for computer professionals, MeasureIT features informative articles, CMG regional and national updates, book reviews, and more!

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MeasureIT Issue 16.2

Editors: Richard Gimarc and Igor Trubin


About this issue

We are pleased to present you with our new issue of MeasureIT. This issue includes three papers from our members that provide relevant information on three different topics; Web performance analysis, data visualization and capacity planning

We are interested in hearing from you; comments, questions, or suggestion for articles.  You can send your ideas to  or   Of course, there is always the formal route via e-mail to  We read and respond to all comments.   


1         Queuing Theory: Usage Limitations in IT

By Dr. Terry Critchley

In this article Dr. Critchley introduces the phenomenon he calls dispersion in queuing network models.  Dispersion occurs when you have a set of chained service centers where the arrival rate at the (n-1)th service center is dependent on the completion rate of the previous (n-1)th service center.  The purpose of the article is to introduce the concept and reinforce the fact that you need to understand the assumptions and limitations of any modeling approach since theory may not always truly represent reality.


2         imPACt Conference Update

By Bryan Drake & Elisabeth Stahl

Bryan is the General Chair and Elisabeth Stahl is the Program Chair for this year’s CMG imPACt conference, November 7-10.  In this short note Bryan and Elisabeth highlight the subject areas and content that will be available in November.  Be sure the check the CMG web site for more details about this year's conference.


3         The Use of Natural Forecasting Units

By John M. Reyland

John’s paper is part of our “I’ve seen this before” series.  This paper was presented at the CMG 1987 International Conference.  Even though this paper is almost 30 years old, it addresses a subject that is just as important today as it was back in the days of the mainframe, namely, using Natural Forecasting Units (NFUs) to drive capacity planning.

The paper is a tutorial that describes the identification, measurement and use of NFUs to drive the forecasting and prediction of future workload volumes and resource usage.  The systems we support today have an ever increasing variety and number of end users (both internal and external).  It is imperative that we find a way to describe the workload they place on our systems using terminology that is consistent and understandable by both IT and the business it supports -- NFUs are the answer.

If you have suggestions for other papers that make you think “I’ve seen this before”, let us know.


4         Q&A: Meet CMG's New Managing Director

By Kevin Mobley & Matt Sarrel

On June 1 CMG hired its first ever Managing Director.  MeasureIT sat down with our CMG President Kevin Mobley and the new Managing Director Matt Sarrel for a short question and answer session.  This is meant to be an introduction to Matt where we learn about his background and its plans for moving CMG forward..


5         The Hot 10 - Top 10 downloads from the CMG Digital Library  (June - July, 2016)

By Igor Trubin & Richard Gimarc

This is a new MeasureIT section where we will list the Top 10 downloads from the CMG Digital Library (similar to the weekly ranking for music downloads).  We will be updating this ranking with each MeasureIT publication.

Call for Content

MeasureIT is published as a free service to the IT community dedicated to capacity management and performance engineering - both CMG members and non-members alike.  Be sure to share this link with friends and colleagues.  Every issue is made possible through the hard work and dedication of the MeasureIT volunteer staff and the contributions of willing writers.

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Check the CMG site to see if there is a US Regional Group an International Group that you might attend.  All CMG-related events are listed on the CMG calendar.

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