Illustration of symbols: U is an arbitrary backlog item L – maximum possible size of any backlog item from the backlog P – absolute precision of estimation the point on the horizontal axis linked to item U shows its size.Īs we well know from the basics of Information Theory, information (also called mutual information of two experiments, see for more detail) enclosed in experiment A regarding experiment B can be expressed as follows: In fact, XP scale is itself exponential and Fibonacci scale can be roughly approximated for the range of the values defined above with f(x) = 1.6 x-1 as shown in the figure below:įigure 2. Also we often call these scales (not 100% accurately though in general case) exponential. We call them progressive to reflect the fact that the values grow much faster than linearly. Less common is the scale used by XP proponents: 0, 1, 2, 4, split (we will refer to this estimation scale as XP Scale further in the text). In Agile we quite often see the examples of “progressive” estimation scale when estimating the size of backlog items. Also we will formulate a hypothesis about normalization of the estimation base. We will use pretty basic principles of Information Theory to arrive at our results. Luckily I found a way to do i with our favourite php soap toolkit.In this article we will show that progressive estimation scale, like Fibonacci sequence often used by agile teams, is more efficient than linear scale and provides the team with more information about the size of backlog items. I was so desperate, that I have been posting raw XML with CURL to mimic the SOAP Request. I usually work in php nusoap and I had trouble finding the right way to do this. Especially when you are working with Chinese low-end equipment. This should make your life a lot simpler when dealing with SOAP Web Services.īut there are times that all the frameworks and toolkits in the world wont be able to produce the desired plain XML structure of the SOAP call. In my last blog post I described how to use wsdl2php to parse a wsdl file and generate php classes.

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