ENGINEERING SUPPORT SERVICES THE PROFESSIONAL SERVICES DESCRIBED ABOVE OFTEN REQUIRE ENGINEERING SUPPORT SERVICES. GEOTECHNICAL ENGINEERING FOR EXAMPLE, FREQUENTLY REQUIRES SERVICES SUCH AS TAKING SOIL AND ROCK BORINGS, EXCAVATING TEST PITS SAMPLING, AND IDENTIFYING SOIL AND EARTH MATERIALS, FIELD AND LABORATORY TEST AND GEOGRAPHYSICAL MEASUREMENTS AND OBSERVATIONS. THE ENGINEERING SUPPORT SERVICEES IN GENERAL CIVIL ENGINEERING PRACTICE MAY INVOLVE DRAFTING, LAND AND CONSTRUCTION SURVEYING, AND OTHER DATA GATHERING ACTIVITIES FOR SPECIALIZED PURPOSES. ALTHOUGH PERSONS WHO ARE NOT CIVIL ENGINEERS SOMETIMES ACCOMPLISH SOME OF THESE TASKS, THE PROCUREMENT OF ADEQUATE AND CORRECT DATA USUALLY REQUIRES PROFESSIONAL CIVIL ENGINEERING JUDGEMENT AND GUIDANCE. SINCE SOUNDNESS OF ANY ENGINEERING DECISION IS DEPENDENT UPON THE ACCURACY AND SUITABILITY OF DATA OBTAINED IN FIELD AND LABORATORY INVESTIGATIONS THESE SUPPORTING SERVICES MUST BE UNDER THE GUIDANCE OF THE CIVIL ENGINEER WHOSE DECISIONS WILL BE BASED UPON THOSE DATA. ENGINEERING SUPPORT SERVICES ARE IMPORTANT IN PROFESSIONAL SERVICES. LIKE IN GEOTECHNICAL ENGINEERING THEY WOULD NEED SUPPORT SERVICES IN TAKING SOIL AND ROCK BORINGS, EXCAVATING TEST PITS SAMPLING, AND IDENTIFYING SOIL AND EARTH MATERIALS, FIELD, AND LABORATORY TEST AND GEOGRAPHYSICAL MEASUREMENTS AND OBSERVATIONS. IN GENERAL CIVIL ENGINEERING THERE ARE ALSO SUPPORT SERVICES SUCH AS DRAFTING, LAND AND CONSTRUCTION SURVEYING, AND OTHER DATA-GATHERING ACTIVITIES FOR SPECIALIZED PURPOSES. WHILE NON- ENGINEERS MAY PERFORM THESE TASKS, THE ACCURACY AND SUITABILITY OF THE DATA OBTAINED DURING FIELD AND LABORATORY INVESTIGATIONS ARE CRITICAL. THEREFORE, THESE SUPPORTING SERVICES MUST BE DONE UNDER THE GUIDANCE OF A CIVIL ENGINEER. THEIR DECISIONS ARE BASED UPON THE DATA COLLECTED DURING THESE CRITICAL PROCESSES.