The present invention relates to a method for providing and assembling scaffolding units, each of which will be assembled from individual scaffolding components (of a scaffolding system) for constructing an industrial plant, in particular a petroleum refinery, comprising the following steps: a) Providing a 3D construction plan of the industrial plant; b) Providing a construction schedule for the industrial plant in order of occurrence, depicting the individual sections/phases of construction of the industrial plant to be realized simultaneously and/or successively; c) Selecting and drawing of scaffolding units to be used in the individual sections or phases of construction of the industrial plant in the 3D construction plan; d) Specifying the erection time required to erect the respective scaffolding unit; e) Specifying the dismantling time required to dismantle the respective scaffolding unit; f) Dividing the construction schedule into time intervals; g) Calculating for every single time interval, while taking into consideration the erection and dismantling times of the scaffolding units, the respective number of scaffolding components of identical design which are used simultaneously; h) Determining the maximum number of scaffolding components of identical design which are used simultaneously across all time intervals; i) Providing, for constructing the industrial plant, the maximum number of scaffolding components of identical design alone, or providing the maximum number of scaffolding components of identical design including a defined number of a buffer of scaffolding components of identical design; j) Beginning of assembly of the scaffolding units to be used in a respective phase of construction from the scaffolding components each required for this purpose on-site at a point in time chosen in dependency of the specified erection time each at the latest prior to a start of construction in the respective section of construction specified in the construction schedule.