The subjects of the [[Explorer]] are grouped into modules which follow the parts of a business rather than the structure of the platform. A module is a folder in the tree and holds no data of its own. The modules are: - "General Ledger": the financial administration, and by far the largest module; - "Marketing", "Sales", "Human Resource Management" and "Manufacturing": each holding the articles seen from that angle; - "Inventory": the articles and the warehouses holding them; - "Projects": the projects. Opening a module fetches nothing; it only shows which subjects sit under it: ![[20260903-business-general-ledger.png]] The nine subjects under "General Ledger" follow the order in which they build on one another: first what classifies a booking, then the accounts and journals, then the years and periods, and last the transactions and their lines. ## Why the Same Subject Appears Several Times "Articles" sits under five modules. It is the same subject each time, reading `BUS_ARTICLES_R`, and it is repeated because a reader looking for articles looks under the module they work in rather than under one place chosen by the product.