The procedure for checking data within level 1 consists of the check of data for their availability, meaning the existence of a data file, its readability/processability and standardisation (Figure ). Further, the availability of a machine-readable chemical structure is checked. The machinereadable chemical structure can be considered as additional metadata. The availability of analyses is approved by the presence of textual descriptions for the different measurement types. For the mandatory additional metadata as well as the analyses, no further checks of readability and standardisation are necessary as the input options of the Chemotion systems enforce the support of the desired standards.