Allocating costs on the basis of the number of landscape designs ignores the fact that some complex designs take much longer than simple designs and so will place greater demands on design support resources. The Sunset Office Park design is one of 30 designs budgeted to be done by LawnCare USA (which accounts for 3.33% (1÷30) of landscape design costs). However, based on landscape design-hours, the Sunset Office Park job is much more complex than the average design and accounts for 8% (40 ÷ 500 budgeted design hours). As a result design support costs allocated to the Sunset Office park job ($3,960) is lower if LawnCare USA uses the number of landscape designs as the allocation base compared to the $9,504 allocated when LawnCare USA uses time-driven activity-based costing (TDABC) that uses landscape-design hours and takes into account that complex landscape designs require more hours and hence more landscape design resources. I would recommend that LawnCare USA uses TDABC and landscape-design hours to allocate design support resources to jobs. The main advantage of this approach is that it helps distinguish the costs and demands placed on resources by complex landscape designs relative to simple landscape designs.