This part of ISO 15143 specifies system architecture for the exchange of data related to the use of earth-moving machinery, as defined in ISO 6165, and mobile road construction machinery, as defined in ISO 22242 when used for work similar to earth-moving, in worksite data-controlled construction operations. It also applies to worksite data exchange for the purpose of services related to machine use (see Clause 4) and gives definitions of terms related to worksite data exchange. It covers only the application layer of the OSI reference model according to ISO/IEC 7498-1, and does not cover the presentation, session, transport, network, data link or physical layers of the model. Specific agreement (selection of applicable specifications, standards, etc.) relating to those layers will therefore be needed if data exchange is to be facilitated. This part of ISO 15143 is applicable to the following construction worksite data exchanges: a) information exchanged between contractor and site information system (execution phase): 1) information from contractor to site information system, such as basic project data, design data, operational conditions; 2) information from site information system to contractor, such as achieved work data, machine working record; b) information exchanged between site information system and construction machine: 1) information from site information system to construction machine, such as mission data including target data; 2) information from construction machine to site information system, such as machine working records (productivity) and machine running records (health). c) information exchanged between site information system and measuring equipment: 1) information from site information system to measuring equipment such as trigger data; 2) information from measuring equipment to site information system such as measurement records including measurement data. It is not applicable to information exchanged between project owner and contractor: — information from project owner to contractor such as project information, drawing designed topographic data and survey data; — information from contractor to project owner such as record drawing and record of quality control. However, the possibility of its application to this area is not excluded. See Figure 1. Figure 1 — Information exchange relating to worksite data exchange The term construction machine is used here as a concept. The actual machine may contain measuring equipment and/or a data operation system. Construction machines are intended to be in the state in which they are delivered by the manufacturer. ISO 15143 applies to open system data exchange and may be applicable to closed systems. See Clause 4 for ISO 15143-applicable services.