Car contains one Engine
Car uses Petrol
Engine contains many SparkPlug
Petrol is Fuel
EnterCar then StartEngine
StartEngine then DidItStart
DidItStart yes then DriveHome
DidItStart no then WantToTryAgain
WantToTryAgain yes then StartEngine
WantToTryAgain no then Panic
DriveHome then Done
Man has many Leg
Leg has one Foot
Foot has many Toe
Man is Human
Human is Mammal
Hominoidea has Hominidae
Hominidae has Homininae
Homininae has Hominini
Human is Hominini
Chimpanzee is Hominini
Gorilla is Homininae
Orangutan is Hominidae
Gibbon is Hominoidea
Simple
Relationships described using is, has, contains, and uses between entities.
Specify cardinality with one or many.
Use singular form - in other words pidgin English!
Flowcharts described using then between steps.
Specify any conditions before, such as yes, no, or drunk.
Whether it's sketching a quick idea, or managing a model with hundreds of relationships, you edit the relationships instead of wasting hours on fiddly drawings.