Once you have defined your objectives and indicators, you need to collect and analyze data that will show the impact and ROI of your training program. You can use different methods and sources of data, such as surveys, tests, interviews, observations, feedback, reports, records, and analytics. You should collect data before, during, and after your training program, to compare the baseline, intermediate, and final results. You should also use a control group or a comparison group, to isolate the effects of your training program from other factors. You should analyze the data using appropriate tools and techniques, such as statistics, graphs, charts, and formulas, to calculate the impact and ROI of your training program.