A histogram is a very simple diagram and doesn’t take much time to create. It illustrates a data point in history in order to calculate the probability of something happening in the future. In general, if we notice a trend of a event or action happening in a specific period, we can plan for the same event or action in the future, given the same circumstances.
Control charts are used for statistical analysis to determine if a process is in a stable state of control. Control charts are very similar to run charts, except that control charts have additional lines for upper and lower control limits. Control charts help us to determine the effectiveness of our quality control over time and view irregularities in order to improve our control quality.
A stratification diagram, also known as a flowchart or run chart, is used to determine the relationship between two or more sets of data. Stratification diagrams are helpful for making patterns visible when data is coming from a wide variety of sources. These patterns can be compared to the various systems under test so that we can, once again, adjust our processes in order to improve quality.
The check sheet is, by far, the easiest report to produce. The only thing required is an Excel-type application for columns and rows. The header should be a fact for the dimension you are tracking. This fact is usually something like a day of the week, week of the month or another time-based milestone, but it doesn’t have to be. The row dimensions are the defect types you are tracking. So, as an example, let’s say we are tracking defects on a web application that’s under development.