Guarantee. Construction period and quality refer to the construction project being completed within the specified time and meeting the expected quality requirements. In terms of guaranteeing construction time and quality, it is okay to use guarantee. Guarantee refers to taking measures to ensure that something is realized or that expected effects or results are achieved, such as taking measures to ensure that a construction project can be completed on time, or taking measures to ensure that the quality of the project meets expected requirements. To emphasize taking measures to ensure construction schedule and quality, the word guarantee can be used.