Abstract: A computer-implemented method of generating building instructions for a building block model, comprising: retrieving a digital representation of the building block model; wherein said digital representation is indicative of a sequential construction order in which a plurality of virtual building blocks have been positioned in response to user commands during a computer-implemented virtual construction process, said virtual construction process resulting in a virtual building block model; and generating graphical representations of at least a first and a second part-model of respective first and second subsets of said plurality of virtual building blocks; wherein the second subset includes the first subset and a predetermined number of additional virtual building blocks of said plurality of virtual building blocks; and wherein the additional virtual building blocks are subsequent to all virtual building blocks in the first subset with respect to a sequential instruction order derived from the sequential constr