Based on a case study performed in industry, this work deals with a statistical analysis of data collected during usability testing. The data is from tests performed by usability testers from two companies in two different countries. One problem in the industrial situation is the scarcity of testing resources, and a need to use these resources in the most efficient way. Therefore, the data from...

We report on the sensitivity analysis of a state variable model (Model S) proposed earlier. Model S captures the dominant behavior of the system test phase of the software test process. Sensitivity analysis is a mathematical methodology to compute changes in the system behavior due to changes in system parameters or variables. This is particularly important when parameters are calibrated using ...

The dynamic nature of the Web poses problems for usability evaluations. Development times are rapid and changes to Web sites occur frequently, often without a chance to reevaluate the usability of the entire site. New advances in Web developments change user expectations. In order to incorporate usability evaluations into such an environment, we must produce methods that are compatible with the...

This article aims to provide a simple robust method to test the parameters of a normal population by using the new diagnostic tool called the “Forward Search” (FS) method. The most commonly used procedures to test the mean and variance of a normal distribution are Student’s t test and Chi-square test, respectively. These tests suffer from the presence of outliers. We introduce the FS version of...

As COVID-19 was declared as a pandemic by the World Health Organization (WHO) in March 2020, it is an emerging need to discuss different aspects of this pandemic. In any pandemic, valid and rapid laboratory diagnostic tests are critically important for early diagnosis, which will increase the rate of successful treatment and more importantly prevent the spread of the disease.  

Software testing is hard, expensive, and uncertain. Many protocols have been suggested, especially in the area of conformance veri cation. In order to compare the e cacy of these protocols, we have implemented a designed simulation experiment that examines performance in terms of testing costs and risks. We nd that no single method dominates all others, and provide guidance on how to choose the...