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Management practices such as timing and placement of manure application , grazing management practices , water table control through subsurface drainage , use of cover crops to recycle nutrients , and placement and design of buffers ; must be developed to prevent movement of excess nutrients to water and air . C. Prior to working with children , the staff member must read and be instructed about the policies and procedures of the center , including those related to hygiene , sanitation , food preparation practices , proper supervision of children , and reporting of child abuse . Using these mechanisms , agricultural producers have the opportunity to address risk assessment issues , crop production practices , and help develop workable risk reduction strategies . The introductory-level independent study course teaches the essentials of food safety , food microbiology , sanitary design principles for facilities and equipment , worker hygiene practices , correct procedures for cleaning and sanitizing , food security , and more . System development controls include development environment security , development personnel security , configuration management security during product maintenance , software engineering practices , software development methodology , modularity , layering , use of failsafe design and implementation techniques ( e.g ., defensive programming ) and development facility security .