The project hours are shown in the at a glance summary as 18155.28 hrs; this is a sum of the hours detailed above in leading hand carpenter etc. Discuss why breaking down the labour hours into trade categories might be useful.

Breaking down the labour hours into trade categories can be useful for several reasons:

1. Resource Allocation: It helps in understanding how many hours are being spent on each trade. This can assist in identifying if certain trades are being over or under-utilized, allowing for better resource allocation in future projects.

2. Cost Analysis: Different trades may have different hourly rates. By breaking down the hours, it can provide a more accurate cost analysis for the project.

3. Performance Evaluation: It can help in evaluating the performance of different trades. If a particular trade is consistently taking more time than estimated, it might indicate a need for additional training or process improvement in that area.

4. Project Planning and Scheduling: Understanding the time taken by each trade can help in better project planning and scheduling. It can assist in predicting the time required for similar projects in the future.

5. Risk Management: If a particular trade is taking more time, it might pose a risk to the project timeline. Identifying such risks early can help in taking corrective actions.

6. Transparency: It provides transparency to all stakeholders about where the time and effort are being spent in the project.