Using NAV4Construction, we can use specific resource cost or price models. When we post resources, we have next quantity fields:

**Quantity**– total time of resource engagement**Waiting time**– time when resources do not make usage, because poor site organization**Extremely Stagnation Time**– time when resources do not make usage, because force majeure**Effective Time**– calculative field =*Quantity – (Waiting time + Extremely Stagnation Time)*

In NAV4Construction, we use Cost field for actual resource cost and Price form internal resource cost (transfer price for internal needs). Cost and Price are not calculate in the same way. Definition of them are placed on:

- Quantity:
**Cost**– ‘Direct Unit Cost’ on Resource Card**Price**– ‘Unit Price’ on Resource Card

- Waiting time:
**Cost**– same as Quantity Cost**Price**– ‘Standby Unit Price’ on Resource Card (using of this price depends of setup)

- Extremely Stagnation Time:
**Cost**– no**Price**– no

## Cost Calculation

Cost Calculation is always the same. This calculation is based on resource usage and we calculate it by next pattern: *Direct Unit Cost X ( Quantity – Extremely Stagnation Time )*

If we want to use total quantity in calculation, we need to put ‘Extremely Stagnation Time’ blank.

## Price Calculation

Price Calculation is more complex and depends of setup in ‘Res. Utilization Margin %’ field at Construction Setup. In this field we need to configure what is ‘acceptably utilization’ for us. In our example I will define that it is 70%. That means that if *(Quantity-Waiting Time)* is 70% or more in regard to total Quantity, this is good usage. Based on this, we have two different models of price calculation (we will use factor 0,7 instead of 70%):

### Model 1: ( Quantity – Waiting Time ) >= 0,7 X Quantity

*( Quantity – ( Waiting time + Extremely Stagnation Time ) ) X Unit Price*

### Model 1: ( Quantity – Waiting Time ) < 0,7 X Quantity

*( ( Quantity – ( Waiting time + Extremely Stagnation Time ) ) X Unit Price ) + ( Waiting time X Standby Unit Price )*

These Costs and Prices are the base of Construction Position cost and price calculation, based of their actual consumption.