diff --git a/SUMMARY.md b/SUMMARY.md
index 7a34be18..797bc813 100644
--- a/SUMMARY.md
+++ b/SUMMARY.md
@@ -119,13 +119,13 @@
   * [Contribution Guide](contributing/development/dev-contribution-guide.md)
   * [Best Practice Guidelines](contributing/development/best-practice-guidelines.md)
   * [Bounties](contributing/development/bounties.md)
+  * [Architecture](contributing/development/architecture-1.md)
   * [API](contributing/development/api/README.md)
     * [Members](contributing/development/api/members.md)
     * [Users / Emails](contributing/development/api/users-emails.md)
     * [Collectives](contributing/development/api/collectives.md)
     * [Events](contributing/development/api/events.md)
   * [README Integration](contributing/development/readme-integration.md)
-  * [Architecture](contributing/development/architecture.md)
   * [Postgres Database](contributing/development/postgres-database.md)
   * [PayPal](contributing/development/paypal.md)
   * [TransferWise](contributing/development/transferwise.md)
@@ -156,7 +156,6 @@
 * [Issue Labels](internal/issue-labels.md)
 * [DNS Troubleshooting](internal/dns-troubleshooting.md)
 * [Developer Guidelines](internal/developer-guidelines.md)
-* [Architecture](internal/architecture.md)
 * [Testing](internal/testing.md)
 * [Jobs](internal/jobs/README.md)
   * [Enabling Currencies in the Platform](internal/jobs/enabling-currencies-in-the-platform.md)
diff --git a/contributing/development/architecture-1.md b/contributing/development/architecture-1.md
new file mode 100644
index 00000000..37b4afbd
--- /dev/null
+++ b/contributing/development/architecture-1.md
@@ -0,0 +1,67 @@
+# Architecture
+
+## Collectives
+
+In Open Collective, every entity is a collective and can be accessed publicly via their unique slug `https://opencollective.com/:slug`.
+
+A Collective can be of type:
+
+* **COLLECTIVE** e.g. [Webpack](https://opencollective.com/webpack)
+* **EVENT** e.g. [BrusselsTogether Meetup 4](https://opencollective.com/brussels/together/events/meetup-4)
+* **ORGANIZATION** e.g. [iDoneThis](https://opencollective.com/idonethis), [DigitalOcean](https://opencollective.com/digitalocean), etc.
+* **USER** e.g. [xdamman](https://opencollective.com/xdamman)
+
+## Members
+
+A Member connects a User to a Collective. It can have multiple roles \(one role per row\):
+
+* **HOST** legal holder of the bank account that holds the money on behalf of the collective
+* **ADMIN** users who can approve expenses for the collective
+* **MEMBER** aka core contributors
+* **BACKER** users who gave money to the collective
+* **FOLLOWER** used atm for users interested in an event collective
+
+## Orders
+
+An Order is the intent to give or withdraw money from a Collective. It is created by a UserId on behalf of a collective \(which can be their own UserCollective or any other Collective that they are a member of\).
+
+Attributes:
+
+| Attribute | Definition | Example |
+| :--- | :--- | :--- |
+| type | type of order | EXPENSE\|DONATION |
+| UserCollectiveId | User who created the order | /xdamman |
+| FromCollectiveId | Source of the money | /digitalocean |
+| ToCollectiveId | Destination of the money | /webpack |
+| currency | currency of the ToCollectiveId | USD |
+| amount | amount in cents | 10000 |
+| SubscriptionId | References recurring subscription |  |
+| status | status of the order | PENDING -> APPROVED\|REJECTED -> PAID |
+
+## Transactions
+
+A Transaction records money moving from one Collective to another Collective. In this example, a collective [webpack](https://opencollective.com/webpack) is giving €100 to [Women Who Code Berlin](https://opencollective.com/wwcodeberlin) hosted by [Women Who Code 501\(c\)\(3\)](https://opencollective.com/wwcode).
+
+| Attribute | Definition | Example |
+| :--- | :--- | :--- |
+| OrderId | References the order | 1 |
+| FromCollectiveId | Source of the money \(virtual account\) | /webpack |
+| ToCollectiveId | Destination of the money \(virtual account\) | /wwcodeberlin |
+| PaymentMethodId | Payment method \(e.g. if there wasn't enough funds in the `FromCollectiveId`\) | `NULL` |
+| FromHostId | Source of the money | /opensource |
+| ToHostId | Destination of the money | /wwcode |
+| FromHostAmount | total amount in cents paid by the host of the `FromCollectiveId` in the currency of the host | -11481 \(-$114.81\) |
+| FromCollectiveAmount | total amount that increases/decreases the balance of the `FromCollectiveId` in the currency of the FromCollectiveId | -11481 |
+| paymentProcessorFeesInHostCurrency | fees for the payment processor in cents |  |
+| hostFeesInHostCurrency | fees for the host in cents in the currency of the host \(which might be different than the currency of the collective, e.g. WWCode \(USD\) and WWCode Berlin \(EUR\) | 574 \(5% of €100 in USD\) |
+| platformFeesInHostCurrency | fees for the platform \(Open Collective\) | 574 \(5% of €100 in USD\) |
+| ToHostAmount | net amount in cents received by the host of the `ToCollectiveId` in the currency of the `ToHostId` | 9630 \(€100 - \(2.9% + $0.30\) - €5 platform fee\) |
+| ToCollectiveAmount | total amount that increases/decreases the balance of the `ToCollectiveId` in the currency of the order | 9580 \(€96.30 - €5 host fee\) |
+| FromHostCurrency | currency of the `FromHostId` | USD |
+| FromCollectiveCurrency | currency of the `FromCollectiveId` | USD |
+| ToCollectiveCurrency | currency of the collective that receives the money | EUR |
+| ToHostCurrency | currency of the order \(currency of the `ToCollectiveId`\) | USD |
+| fxrate | Foreign eXchange Rate from the currency of the order \(`ToCollectiveCurrency`\) to the currency of the host of the `FromCollectiveId` \(float\) | 1.15 |
+
+Note: The Collective currency might be different than the Host Currency \(both for the source "From" and the recipient "To"\). The fxrate only takes into account the conversion between `ToCollectiveCurrency` to `ToHostId`.
+