---
title: "What is an aggregate with Thomas Ploch"
source: "https://virtualddd.com/sessions/what-is-an-aggregate-with-thomas-ploch/"
date: 2019-11-06
tags: ["aggregate", "functional programming", "tactical design"]
type: "Online session"
host: "Kenny Schwegler"
guests: "Thomas Ploch"
video: "https://www.youtube.com/embed/7h3DqZmvF9A"
---

# What is an aggregate with Thomas Ploch

Within the community there is been an ongoing discussion about the aggregate pattern. From Eric Evans perspective it is:
An architectural pattern that enforces the consistency of a set of interrelated constraints, by defining a transactional boundary, a concurrency boundary, and a distribution boundary. A lot of people seem to have different perceptions, different explanations or altogether don't think we need to use the pattern. In this #VDDD meetup, Thomas Ploch will tell us his vision and after we will open the dialogue and try to make more explicit: What is an aggregate and how do we teach this to other people.