For instance, it could be an HPLC separation method, a synthesis unitary operation such as filtration or heating, or a robot simple task such as moving a plate from point A to B. It is possible for a single piece of equipment to have multiple BMs. At the next level (level 3 sub-groups in Figure ), the BMs are represented as simple line commands with the appropriate variables. They can be grouped into more complex workflows (method level 3, M3) to combine systematically different actions of grouped equipment. This approach facilitates the systematic organization of actions and ensures operational integrity. In the GLAS architecture, BMs and low-level methods M3 are specified in the configuration of nodes (cf. Listing 1, Snippet Code 1). Nodes may be either instruments of the Executor level or level 3 Sub-Schedulers associated with a dedicated group of instruments. At the upper level (level 2), BMs or M3s are called through command lines again with the appropriate variables and parameters and are combined in higher-level methods M2 defined as workflows (cf. Listing 1, Snippet Code 2).