The general manager of a hotel has asked for a project to put in new landscaping around the building. The project manager has constructed a high-level work breakdown structure (WBS) for the project, which is provided below.

WBS ID Description
1.0 Landscaping
1.1 Plans
1.2 Site preparation
1.3 Sprinklers
1.4 Sidewalks and curbing
1.5 Planting
Which activity would it be logical to add to the approved high-level WBS to provide more detail on the work to be accomplished?