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While I managed to achieve some small discounts it soon became clear that there are some basic factors to be understood and hurdles to be over-come . Heersche talked about some key factors to maximize fertility . Some environmental factors to look out for are mechanical damage , drought stresses , insect infestations , and parasitic fungi . The study has identified some key factors to study how networks work to achieve their functions , including : governance , location and scope , capacities and skills , resources , membership , communications , the external environment and adaptive capacities .