DDD Glossary http://dddcommunity.org/resources/ddd_terms/

Question 1

Define: Aggregate

Answer 1

A cluster of associated objects that are treated as a unit for the purpose of data changes. External references are restricted to one member of the AGGREGATE, designated as the root. A set of consistency rules applies within the AGGREGATE’S boundaries.

Question 2

Define: Assertion

Answer 2

A statement of the correct state of a program at some point, independent of how it does it. Typically, an ASSERTION specifies the result of an operation or an invariant of a design element.

Question 3

Define: Bounded Context

Answer 3

A description of a boundary (typically a subsystem, or the work of a particular
team) within which a particular model is defined and applicable.

Question 4

Define: Client

Answer 4

A program element that is calling the element under design, using its capabilities.

Question 5

Define: Cohesion

Answer 5

Logical agreement and dependence.

Question 6

Define: Command

Answer 6

(a.k.a. modifier) An operation that effects some change to the system (for example, setting a variable). An operation that intentionally creates a side effect.

Question 7

Define: Context

Answer 7

The setting in which a word or statement appears that determines its meaning.

Question 8

Define: Context Map

Answer 8

A representation of the [Bounded Context]s involved in a project and the actual relationships between them and their models.

Question 9

Define: Core Domain

Answer 9

The distinctive part of the model, central to the user’s goals, that differentiates the application and makes it valuable.

Question 10

Define: Declarative Design

Answer 10

A form of programming in which a precise description of properties actually controls the software. An executable specification.

Question 11

Define: Deep Model

Answer 11

An incisive expression of the primary concerns of the domain experts and their most relevant knowledge. A deep model sloughs off superficial aspects of the domain and naive interpretations.

Question 12

Define: Distillation

Answer 12

The abstraction of key aspects in a model, or the partitioning of a larger system to bring the CORE DOMAIN to the fore.

Question 13

Define: Domain

Answer 13

A sphere of knowledge, influence, or activity.

Question 14

Define: Entity

Answer 14

An object defined by a thread of continuity and identity (not by its attributes)

Question 15

Define: [Pure] Function

Answer 15

An operation that computes and returns a result without observable side effects.

Question 16

Define: Immutable

Answer 16

The property of never changing observable state after creation.

Question 17

Define: Invariant

Answer 17

An Assertion about some design element that must be true at all times, except during specifically transient situations such as the middle of the execution of a method, or the middle of an uncommitted database transaction.

Question 18

Define: Layered Architecture

Answer 18

A technique for separating the concerns of a software system, isolating a domain layer, among other things.

Question 19

Define: Life Cycle

Answer 19

A sequence of states an object can take on between creation and deletion, typically with constraints to ensure integrity when changing from one state to another. May include migration of an [Entity] between systems and different [Bounded Contexts].

Question 20

Define: Model

Answer 20

A system of abstractions that describes selected aspects of a domain and can be used to solve problems related to that domain.

Question 21

Define: Repository

Answer 21

A mechanism for encapsulating storage, retrieval, and search behavior which emulates a collection of objects.

Question 22

Define: Service

Answer 22

An operation offered as an interface that stands alone in the model, with no encapsulated state.

Question 23

Define: Unification

Answer 23

The internal consistency of a model such that each term is unambiguous and no rules contradict.

Question 24

Define: Value Object

Answer 24

An object that describes some characteristic or attribute but carries no concept of identity.

Question 25

Define: Implicit Concept

Answer 25

A concept that is necessary to understand the meaning of a model or design but is never mentioned.