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The GANTT Procedure

Example 4.23: Multiproject Gantt Charts

The following example illustrates an application of the PATTERN variable to display summary bars for subprojects. The LAN Selection Project (Bostwick 1983) consists of eight subprojects, two of which represent the beginning and ending of the master project. The data set LANACT defines the structure of the project. The ACT and SUCC variables define the precedence relationships, the PARENT variable defines the parent task, and the DAYS variable contains the duration of the activity.

The project is scheduled using the CPM procedure with a PARENT statement to identify the parent. The schedule data set, SCHED, is created by appending a _PATTERN variable to the output data set generated by CPM. The value of this variable is set to '4', corresponding to subprojects, and set to missing otherwise. This results in the subproject bars being filled using PATTERN4, namely a solid black pattern. The ACTID variable is indented within the DATA step to reflect the level of each activity in the project hierarchy when used as the ID variable.

A Label data set,LABELS, is created in order to add markers to both ends of the schedule bars that correspond to subprojects. The two observations in the LABELS data set are linked to the SCHED data set via the _PATTERN variable.

The GANTT procedure is next invoked to produce the Gantt chart in Output 4.23.1. The LABVAR=_PATTERN specification establishes the link between the Schedule and Label data sets. The ACT= and SUCC= options are used to display the precedence relationships between activities.

pattern1 c=blue   v=r5;         /* Non-critical duration  */
pattern2 c=blue   v=e;          /* Slack duration         */
pattern3 c=red    v=x5;         /* Critical duration      */
pattern4 c=black  v=s;          /* Project duration       */

data lanact;
format act $30. succ $30. parent $20.;
input act & succ & parent & days;
Measure Current Volume     Forecast Future Volume     NEEDS ASSESSMENT       2
Literature Survey          Manufacturer Demos         MARKET SURVEY          5
Determine Current Users    Forecast Future Needs      NEEDS ASSESSMENT       2
Forecast Future Volume     Prepare Network Spec       NEEDS ASSESSMENT       2
Manufacturer Demos         Identify Vendors           MARKET SURVEY          5
Forecast Future Needs      Prepare Network Spec       NEEDS ASSESSMENT       2
Identify Vendors           .                          MARKET SURVEY          2
Prepare Network Spec       .                          NEEDS ASSESSMENT       2
Prepare RFQ                Evaluate Vendor Responses  VENDOR SELECTION       4
Prepare Cable Plan         Procure Cable              SITE PREPARATION       4
Evaluate Vendor Responses  Notify Final Candidate     VENDOR SELECTION      15
Procure Cable              Install Cable              SITE PREPARATION      22
Notify Final Candidate     Negotiate Price/Config     VENDOR SELECTION       1
Install Cable              .                          SITE PREPARATION      10
Negotiate Price/Config     Prepare Purchase Order     VENDOR SELECTION       3
Prepare Purchase Order     .                          VENDOR SELECTION       1
Server Functional Spec     Server Detail Design       SPECIAL HARDWARE       5
Procure LAN Hardware       Receive Network Hardware   NETWORK INSTALLATION  25
Server Detail Design       Server Coding              SPECIAL HARDWARE      10
Receive Network Hardware   Install LAN Hardware       NETWORK INSTALLATION   4
Server Coding              Test Server Code           SPECIAL HARDWARE      10
Install LAN Hardware       Test Network               NETWORK INSTALLATION   7
Test Server Code           Install/Integrate Server   SPECIAL HARDWARE       5
Test Network               .                          NETWORK INSTALLATION   5
Install/Integrate Server   .                          SPECIAL HARDWARE       2
BEGIN PROCUREMENT          NEEDS ASSESSMENT           .                      .
BEGIN PROCUREMENT          MARKET SURVEY              .                      .
NEEDS ASSESSMENT           VENDOR SELECTION           .                      .
NEEDS ASSESSMENT           SITE PREPARATION           .                      .
MARKET SURVEY              Prepare Network Spec       .                      .
VENDOR SELECTION           NETWORK INSTALLATION       .                      .
VENDOR SELECTION           SPECIAL HARDWARE           .                      .
SITE PREPARATION           Install LAN Hardware       .                      .
NETWORK INSTALLATION       NETWORK AVAILABLE          .                      .
SPECIAL HARDWARE           NETWORK AVAILABLE          .                      .

proc sort data=lanact;
   by act;

proc cpm data=lanact out=lanout
     expand interval=workday date='04nov89'd;
   parent parent / wbs eso;
   activity act;
   duration days;
   successor succ;

 /* create the schedule data set with a pattern variable */
data sched;
   label wbs_code= 'WBS';
   label act='Project/Activity';
   set lanout;
   if proj_lev !0 then do;
     if parent='' then _pattern=4;
     do i=1 to  proj_lev-1; /* indent the id values */
        actid = "   " || actid;

proc sort data=sched;
   by es_asc wbs_code;

 /* create the label data set */
data labels;
   _xvar='e_start ';

title1 f=swiss 'Gantt Example 23';
title2 f=swiss 'Displaying Summary Bars For Each Subproject';

proc gantt data=sched labdata=labels;
   id actid wbs_code;
   chart / pcompress nojobnum increment=7 scale=1.5
           ctext=black caxis=black font=swiss
           mindate='01nov89'd maxdate='28feb90'd
           minoffgv=1.5 minofflv=1.5 cprec=black wprec=3
           act=act succ=succ;

Output 4.23.1: Using the PATTERN Variable and Labels
ga23.gif (6814 bytes)

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Copyright © 1999 by SAS Institute Inc., Cary, NC, USA. All rights reserved.