The main concept here is how the data collection approaches differ: UCR uses summary counts, while NIBRS collects detailed incident-level data with multiple offense codes per incident. UCR reports annual totals for each offense category, giving a broad snapshot without tying offenses to specific incidents or providing many contextual fields. NIBRS, on the other hand, records each incident in detail and can include several offenses within that single incident, each with its own code and richer contextual information (like weapon used, location, and offender details). This contrast is exactly what the statement conveys: UCR provides summary data, and NIBRS collects detailed incident-based data with multiple offense codes per incident. For example, a single event with several offenses would be captured as multiple offense codes within one incident in NIBRS, whereas UCR would tally those offenses in broad categories without linking them to one incident.