SEKE 2012 Proceedings - Knowledge Systems Institute

process for the network. Thus, this is the post-condition
required for scenario 2.
B. Prototype developed
After the presentation of the scenarios observed, it is
necessary to present a prototype of the proposed model. It is
essential that, at first, we have a software process modeled and
running in the WebAPSEE tool. Another important aspect
concerns the selection of the network model to be u sed by
software components modeling Bayesian networks GeNIe. For
example: if the aspect which you want to monitor in the
process is the Time, it is necessary that the model of Bayesian
network analysis has some node with characteristics related to
Time. The same analogy applies when you want to monitor
other aspects of the process, as Cost, for example. From this it
becomes possible to b egin the process of monitoring and use
the web interface developed. The Fig. 3 shows the web
interface developed.
Figure 3. Web interface for data collection
This web interface is organized basically as follows: a)
Characteristics of the process: at the top of the page are
various HTML controls type radio, where each identifies and
makes it able to be selected each of the different characteristics
relate to a software process, as Time, Cost and Quality; b) Data
related: after selecting a f eature, are displayed in the field
below, various controls type checkbox where eache of them
with respect to a given related to the selected feature. It is
possible to select various data related to the same
characteristic; c) Generate data file: control type button whose
essential function is to confirm the selection of parameters and
initiate the process of generation of the file containing the
process data, subsequent display of data in the informative
table containing the data evidence and boot the Windows
Service responsible for monitoring the database process and
update the data file; d) Informational message: if everything
went as expected and without occurrence of errors, the data file
was created/updated correctly, the Windows Service was
successfully started and the following message is displayed:
“File created/updated successfully. Monitoring service
initialized correctly”. However, if na error occurs during
generation of the data file or during Windows Service boot, the
following message is displayed: “An error occurred while
attempting to generate the file. The monitoring service was not
initialized”; and e) Table containing the data from the
monitored process: after the creation / update of the file
containing the data from the monitored process, a table in the
web interface is responsible for listing the data. This update is
always done periodically and is performed after each Windows
Service execution. The goal is to ensure the ability to view
directly in the table the latest data from the process to enable
the identification of evidence and use them in their Bayesian
network used in software GeNIe or Netica.
IV. MODEL EVALUATION
In the evaluation is modeled a development process in the
WebAPSEE software. The idea is that this process be as similar
as possible with a specified process to model the development
of a real software project, but, being a procedure evaluation for
a model created for proof of concept, the process used is
simplified, containing only features that are fundamental to the
proposed assessment and with reference to the tasks defined by
the RUP (Rational Unified Process) for small projects
methodology. Some Bayesian network models present in the
literature were used and adapted to make them in accordance
with the data that is extracted from the process and are present
in the data file generated by the web interface developed. So,
independent of the chosen characteristic to be monitored , the
Bayesian network defined will allow a true representation of
the running process in the WebAPSEE. The evaluation seeks to
answer some key questions of project managers referring to
changes in estimates that are recur in software projects.
A. Software process
In order to evaluate the proposed model, a process has
modeled considering some of the main activities defined in the
RUP for Small Projects methodology. Using the WebAPSEE
software as a tool for process modeling, aimed to organize the
activities by disciplines, according to what is proposed by
methodology. The used disciplines by the process were:
Requirements, Project Management, Analysis, Implementation,
Tests, Change Management. It is also important to mention that
this is an iterative and incremental process [15], in other words,
each stage is executed several times during the development
process. This allows that our understanding about the problem
increases through successive refinements, making an effective
solution is obtained after many iterations.
B. Bayesian networks models
The modeling of Bayesian networks used for
implementation and evaluation of the evaluated scenarios were
constructed based on the model known as MODIST [16],
which cares about the quality of predictions and wi th risk
management in large software projects. The MODIST project
is based on Bayesian network and it tries to produce
development models and testing process that take into account
statistical concepts missing in traditional approaches to
development. It was decided to develop a Bayesian network to
monitor the Requirements activities set, especially, taking into
account the aspect of time. One reason for having been chosen
by the requirements lies in fact that is in requirements, which
normally has the main problems with estimates. It is also
important to mention that it is completely feasible that new
networks are designed to monitor other aspects and set of
activities, such as Tests, Change Management or Analysis, for
example. Furthermore, could also consider the monitored
process as whole as a single activity and, so, develop a single
network responsible for taking care of all aspects. Since the
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