Crashing is a project management technique used to compress the project schedule by reducing the time required to complete certain tasks. It involves adding additional resources or increasing the amount of work done per unit time in order to complete a task faster than originally planned.

Crashing is typically used in situations where the project is behind schedule, and there is a need to speed up the completion of critical tasks to meet project deadlines. By compressing the project schedule, crashing helps to reduce the overall project duration and can potentially save time and money.

However, it's important to note that crashing usually involves additional costs, such as overtime pay, hiring extra staff, or renting equipment, which can increase the overall project cost. Therefore, before implementing crashing, it's essential to assess the cost-benefit trade-off and ensure that the added cost is worth the time savings gained.

Crashing should be used as a last resort when other options, such as rescheduling, resource leveling, or changing the project scope, have been exhausted. Additionally, it's crucial to carefully monitor the progress of the project during and after the crashing process to ensure that the project remains on track and within budget.