Documentation occurs throughout your project. It creates a context for your project and your data that will make it understandable and reusable. There are study-level and data-level documentation.
Study-level documentation describes aspects of the project such as aims, type of data collected, methodology, and quality assurance processes.
Data-level documentation describes the individual data files or variables.
Documentation can take the form of lab notebooks, annotation, codebooks, variable descriptions, or README files that can be made available alongside your data.
Metadata is simply ‘data about data’. It is structured, standardised, and machine-readable. Metadata is usually provided in the form of a repository record giving broad contextual information about the data such as project title, creator, and subject keywords.