Moreover, the Joint Research Centre (JRC) has issued a "Technical guide to Life Cycle Thinking (LCT) and Life Cycle Assessment (LCA) for waste experts and LCA practitioners" aimed at supporting environmentally sound decisions and complementing the waste hierarchy. The guide focuses on the most relevant technical aspects that need to be considered when applying LCT and LCA to the waste management sector. The guide builds on the International Organization for Standardization (ISO) standards 14040 and 14044 for LCA and the International Reference Life Cycle Data System (ILCD) Handbook.
At first the legs were constructed as cantilevers , but about halfway to the first level, construction was paused in order to create a substantial timber scaffold . This renewed concerns about the structural integrity of the tower, and sensational headlines such as "Eiffel Suicide!" and "Gustave Eiffel Has Gone Mad: He Has Been Confined in an Asylum" appeared in the tabloid press.  At this stage, a small "creeper" crane designed to move up the tower was installed in each leg. They made use of the guides for the lifts which were to be fitted in the four legs. The critical stage of joining the legs at the first level was completed by the end of March 1888.  Although the metalwork had been prepared with the utmost attention to detail, provision had been made to carry out small adjustments in order to precisely align the legs; hydraulic jacks were fitted to the shoes at the base of each leg, capable of exerting a force of 800 tonnes, and the legs were intentionally constructed at a slightly steeper angle than necessary, being supported by sandboxes on the scaffold. Although construction involved 300 on-site employees,  only one person died thanks to Eiffel's stringent safety precautions and the use of movable gangways, guardrails and screens.