How can we use these four different types of charts in the HR function? Please provide examples of when it would be best to use that kind of chart and why it would be the best choice to add value to the analysis of a process outcome and provide data to guide process improvements. 

1) The run chart: A run chart represents data values plotted in time order. A line chart visually displays data trends over time, providing a more accurate conclusion than just viewing the data. 

2) The Gantt Chart: A Gantt chart is a type of horizontal bar chart that displays the start and duration of each task in a project. The y-axis represents the tasks and the x-axis represents the duration of the project. Each task is represented by a bar, and the bar's length corresponds to the task's duration. 

3) The Pareto Chart: The Pareto chart is a helpful graphical tool used to grade business problems based on their frequency. It helps identify the most common problems so that businesses can prioritize them. 

4) The Control Chart: Control charts are an adaptable tool for various industries. There are two primary types of control charts: attribute control charts and variable control charts. Attribute control charts are used for categorical data, such as defective or non-defective products, while variable control charts are used for numerical data, such as weight measurements. In simple terms, a control chart is a graph that tracks how a process evolves over time.