@startuml
class Riequilibrium {
   nome
}

class Employee {
   first name
   last name
   birthday
}


class CEO {
   first name
   last name
   birthday

}

class Specification_Document {
   first name
   last name
   birthday

}

class Specification_Requirement {
   name
   description
   completed
   estimation delivery
   variability in delivery
}

class Report {

}

class Project {
   first name
   last name
   birthday

}

class Contract {

   first name
   last name
   birthday
}

class Developer {
   first name
   last name
   birthday

}

class Secretary {
   first name
   last name
   birthday

}

class Customer {
   first name
   last name
   birthday

}

class Project_Type {

   first name
   last name
   birthday
}

class Payment_Document {
   payed
}

Riequilibrium -- Project_Type : offer service
Project_Type -- Project : is a

Project -- Contract : associated to
Project -- Specification_Document : is related to
Specification_Document o-- Specification_Requirement : is composed of
Riequilibrium -- Employee : works in
Secretary -|> Employee
Developer -|> Employee
Developer -- Specification_Requirement : has assigned
Developer -- Report : send
Report -- CEO : receive
Report -- Specification_Document : is referred
CEO -|> Employee
Customer -- Project :requests
Payment_Document -- Contract : has
CEO -- Specification_Document : creates
@enduml