A method for assembling a structure, said method comprising: locating a position in an assembly stack-up where a fastener is to be installed; drilling a hole through the assembly stack-up at the position; countersinking the hole to a specified depth; operating a calibrated probe to determine at least one parameter associated with one or more of the hole and the stack-up proximate the hole; inserting the fastener into the hole; characterised in that the fastener is a one-sided fastener and in that the method further comprises: applying a rotational torque to the one-sided fastener to complete the installation of the one-sided fastener, wherein applying a torque to the one-sided fastener to complete installation of the one-sided fastener comprises rotating a bolt of the fastener until a frangible drive head breaks away from a remainder of the bolt; comparing a measurement of angular displacement of the one-sided fastener required to complete the installation of the one-sided fastener to a range of angular displacement indicative of correct installation of the fastener; and comparing a measurement of the torque required to complete the installation of the one-sided fastener to a monitored torque-angle curve to verify a correct installation of the fastener. locating a position in an assembly stack-up where a fastener is to be installed; drilling a hole through the assembly stack-up at the position; countersinking the hole to a specified depth; operating a calibrated probe to determine at least one parameter associated with one or more of the hole and the stack-up proximate the hole; inserting the fastener into the hole; characterised in that the fastener is a one-sided fastener and in that the method further comprises: applying a rotational torque to the one-sided fastener to complete the installation of the one-sided fastener, wherein applying a torque to the one-sided fastener to complete installation of the one-sided fastener comprises rotating a bolt of the fastener until a frangible drive head breaks away from a remainder of the bolt; comparing a measurement of angular displacement of the one-sided fastener required to complete the installation of the one-sided fastener to a range of angular displacement indicative of correct installation of the fastener; and comparing a measurement of the torque required to complete the installation of the one-sided fastener to a monitored torque-angle curve to verify a correct installation of the fastener. applying a rotational torque to the one-sided fastener to complete the installation of the one-sided fastener, wherein applying a torque to the one-sided fastener to complete installation of the one-sided fastener comprises rotating a bolt of the fastener until a frangible drive head breaks away from a remainder of the bolt; comparing a measurement of angular displacement of the one-sided fastener required to complete the installation of the one-sided fastener to a range of angular displacement indicative of correct installation of the fastener; and comparing a measurement of the torque required to complete the installation of the one-sided fastener to a monitored torque-angle curve to verify a correct installation of the fastener.