LDIs are based on collaboration.
There are different kind of projects, and there are different ways to develope a project. An LDI is open. This means that the community will decide what kind of project it will be and how it will be developed. An LDI can be developed individually, if there's nobody that wants to join it. An LDI can have a project coordinator, or not. An LDI can collaborate with LDIs with similar purposes, or not. An LDI can be strictly structurated, or not. Important is: an LDI is a project, that means that it leads to activity, has a practical goal, it's open, and it's developed on the web in an LDI-hosting website (see The LDI concept).