shown  in  a  schedule  should interval, such as a day, a week, NETWORK  ANALYSIS be   some   convenient or a month. In  the  late  1950s,  a  new  system  of  project planning,   scheduling,   and   control   came   into widespread  use  in  the  construction  industry.  The critical  path  analysis  (CPA),  critical  path  method (CPM), and project evaluation and review technique (PERT)  are  three  examples  of  about  50  different approaches.  The  basis  for  each  of  these  approaches  is the analysis of a network of events and activities. The generic  title  of  the  various  networks  is  network analysis. The  network  analysis  approach  is  now  the accepted  method  of  construction  planning  in  many organizations.  Network  analysis  forms  the  core  of project   planning   and   control   systems   and   is accomplished by completing the following steps: 1. Develop construction activities.  After  careful review of the plans and specifications (specs), your first step is to break the job down into discreet activities. Construction activities are generally less than 15 days in duration and require the same resources throughout the entire duration. 2. Estimate construction activity requirements. Evaluate   the   resource   requirements   for   each construction  activity.  Identify  and  list  all  of  the materials, tools, equipment (including safety-related items),   and   manpower   requirements   on   the Construction  Activity  Summary  (CASS)  Sheet. 3. Develop logic network.  List  the  construction activities logical] y from the first activity to the last, showing  relationships  or  dependencies  between activities. 4. Schedule construction activities. Determine an estimated start and finish date for each activity based on the sequence and durations of construction activities. Identify the critical path. This will help focus attention of  management  on  those  activities  that  cannot  be delayed  without  delaying  the  project  completion  date. 5. Track resources. As the crew leader, you must be sure the necessary resources are available on the project site on the day the work is to be performed. For materials on site, this will be as easy as submitting a material   request,   NAVSUP   Form   1250-1,   to   the material  liaison  office  (MLO)  several  days  in  advance. For local purchase requirements, such as a concrete request to MLO, a request can be required 2 to 3 weeks in advance. 6. Control resources.  As the crew leader, you are also  responsible  for  on-site  supervision  of  all  work performed.  Productive  employment  of  available resources  to  accomplish  assigned  tasking  is  your greatest  challenge. PROGRESS CONTROL Progress  control  is  the  comparing  of  actual progress   with   scheduled   progress   and   the   steps necessary   to   correct   deficiencies   or   to   balance activities to meet overall objectives. CONSTRUCTION DRAWINGS In planning any project, you must be familiar with construction   drawings   and   specifications.   The construction of any structure or facility is described by a set of related drawings that gives the Seabees a complete  sequential  graphic  description  of  each  phase of  the  construction  process.  In  most  cases,  a  set  of drawings   shows   the   location   of   the   project, boundaries,  contours,  and  outstanding  physical features  of  the  construction  site  and  its  adjoining areas. Succeeding drawings give further graphic and printed  instructions  for  each  phase  of  construction. TYPES OF CONSTRUCTION DRAWINGS Drawings are generally categorized according to their  intended  purposes.  Some  of  the  types  commonly used  in  military  construction  are  discussed  in  this section. Master Plan Drawings MASTER  PLAN  DRAWINGS  are  commonly used  in  the  architectural,  topographical,  and construction fields. The y show sufficient features to be  used  as  guides  in  long-range  area  development. They  usually  contain  section  boundary  lines, horizontal and vertical control data, acreage, locations and  descriptions  of  existing  and  proposed  structures, existing  and  proposed  surfaced  and  unsurfaced  roads and   sidewalks,   streams,   right-of-way,   existing utilities, north point indicator (arrow), contour lines, and profiles. Master plan and general development drawings  on  existing  and  proposed  Navy  installations are  maintained  and  constantly  upgraded  by  the 1-19