Check Points:

$$ Identify entities.

$$ Identify weak entities if any.

$$ Identify derived attribute if any.

$$ Identify total$/$partial participations if any.

$$ Create relationships between entities and denote the cardinalities to each relationship.

$$ Create weak relationship if any.

$$ Create an associate entity for many$-$to$-$many relationship.

Create three Entity$-$Relationship diagrams based on the specification provided. Ensure that each diagram accurately represents the information from its respective specification, clearly indicating identifiers and cardinality constraints.

$1$:

UPS prides itself on having up$-$to$-$date information on the processing and current location of each shipped item. To do this, UPS relies on a company$-$wide information system. Shipped items are the heart of the UPS product tracking information system.

Shipped items can be characterized by item number $($unique$),$ destination, and delivery date. Shipped items are received into the UPS system at a single retail center. Retail centers are characterized by their type, uniquid, and address. Shipped items make their way to their destination via one or more standard UPS transportation events $($i$.$e$.,$ flights, truck deliveries$).$ These transportation events are characterized by a unique schedule Number, a type $($e$.$g$.,$ flight, truck$).$