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UNFORESEEN DEVELOPMENTS New man made developments and projects may have an impact on the original landscape design objectives which could require a modification to the landscape and its management - for example road improvements or changes, adjacent development and so on. Research, experience or unpredicted development could give rise to a need to review the original design objectives - for example:- Particularly rapid establishment and growth of particular species or species combinations. A natural event (a storm perhaps) provides opportunity to develop the landscape in a different direction. Erosion or weathering effects of a particular feature. Disease or pests damaging the scheme. Also new techniques and materials may require adaptations for example; herbicides and fertilisers; availability of plant species; new machinery; and new approaches OBJECTIVES CHANGED The following could have an impact on landscape design objectives; transport or environmental policy changes; changes in fiscal arrangements; new initiatives and trends; evolution of design principles; and greater understanding of the natural world.