Specification pattern

Wed, 23 Sep 2026 15:00:00 +0200

Hi. Today, we’re going to take a look at the Specification pattern. Without further ado, let’s dive in.

Specification is an architectural design pattern introduced by Eric Evans. It is most commonly found in Domain-Driven Design (DDD).

It is mainly based on the mechanisms of composition and Boolean algebra.

The main element of this pattern is the CompositeSpecification class, which implements an interface declaring methods that allow business rules to be nested (And, Or, Not), as well as the IsSatisfiedBy method, which validates all the business rules.

Design Patterns on PBiernat.space

Specification pattern