An insight into measuring your crew’s true performance or efficiency.
Measurement of a crew’s performance on-site in simple terms is quite easy, one simply takes the actual amount over the targeted amount. This calculation will give you an answer but it does not give you any insight into where loss of performance is occurring and whether or not the crew is actually doing well.
Performance (%) = actual achieved amount / targeted planned amount
If the performance of one crew was only 30% versus 70% of another crew, would this be a true reflection of the crews? Most likely not, as the calculation does not take into account any of the factors affecting the crew’s performance. For example, if the first crew only worked one day of the week due to heavy rains, it could have far exceeded the second crew’s performance if it did not rain.
For this reason, if one truly wants to understand your crew’s efficiency and how to improve it, one needs to look a little deeper into the cause of the loss. Depending on the responsibilities of the crew their performance would need to be measured against only that, that they are in control of.
This preferred way to calculate your crew’s efficiency is mathematically similar to the simple formula above, but provides a better understanding of loss and waste in the construction process by breaking it down into four loss factors:
- Schedule Loss
- Availability Loss
- Performance Loss
- Quality Loss
Schedule Loss: Schedule Loss can simply be seen as the time when you were never planning to be productive or work. In other words, the time when no-one is even at work. This is purely a theoretical calculation taking in the total time in the period being reviewed versus that of the working shift time for the same period.
Availability Loss: This Loss includes all events that stop planned production for any appreciable length of time. This varies by the operation but should be seen as a stop and not an interruption. Availability Loss includes Planned Stops and Unplanned Stops during the working shift.
Performance Loss: Performance Loss includes all factors that cause the crew to operate at less than the maximum possible production rate while working. This loss takes small interruptions and slow cycle times into account and may also include the additional time taken due to carrying out an operation differently to what was planned.
Quality Loss: This Loss factor is often overlooked as it is only apparent after the works are carried out. Any re-work due to quality issues would fall fully under this. It is important that this is factored into a crew’s performance rating, otherwise, you run the risk of quality of product not being seen as important.
While the above leads one to perform four different calculations, the results will quickly assist in identifying areas of concern. Often crews are “blamed” for bad performance where the loss is occurring in areas out of their control. Categorizing Loss correctly will go a long way to correct this.
From my experience breaking loss into these four areas, allows one to easily and systematically identify ways to improve. If your crew’s performance is really low, start by trying to identify one improvement per Loss factor. That way, generally speaking, not all the improvements will be your crew’s responsibility, however, their improvement will be amplified as your whole construction process improves with them.