• Clean Architecture

Ubiquitous languages aims to build a common and business oritented language.

• Shared by all parties between the project

  Primary goals : avoiding Common misunderstandings and bad assumptions.

• Vocabulary of domain specific terms

  Nouns, verbs, adjectives, idimatic expressions and even adverbs

Bounded context is the Delimited space where each element in the Ubiquitous language is well-defined meaning. Main adavantages of Bounded Context :

• Remove ambiguity and duplications
• Simply design of Software modules.
• Integration of external components.

Context Map is the diagram that provides comprehensive view of the system being designed.

Event Storming is exploring a business domain starting from observable domain events. It works like:

• Identifying relavant domain events.
• Find what cause the event
• Look at the model surface as a timeline.

The Value Object has very specific characteristics:

• It is used to Measure, quantifies, or describes a thing in the domain.
• Identiity is basded on composition of values.
• Immutable.

• Implement the Domain logic tha belongs to multiple entities.
• Coordinate the activity of aggregates and repositories with the purpose of implementing the business action.

Action in Domain Services come from Requirments and approved by Domain Experts.

Aggregate consists of one or more Entities and ValueObjects which change together. Aggregate must have Aggregate Root, which is parent object of all members of Aggregate. Data changes to Aggregate must follow A.C.I.D rule, which is : Automic, Consistant, Isolated and Durable.

In the Domain Driven Design book Eric Evans states, "An aggregate is a cluster of associated objects that we treat as a unit for the purpose of data changes."