MODEL:
SETS:
   TASKS / DESIGN, FORECAST, SURVEY, PRICE,
    SCHEDULE, COSTOUT, TRAIN/: TIME, ES, LS, SLACK;

   PRED( TASKS, TASKS) / 
    DESIGN,FORECAST,
    DESIGN,SURVEY,
    FORECAST,PRICE,
    FORECAST,SCHEDULE,
    SURVEY,PRICE,
    SCHEDULE,COSTOUT,
    PRICE,TRAIN,
    COSTOUT,TRAIN /;
ENDSETS

DATA: 
   TIME = 10, 14, 3, 3, 7, 4, 10;
ENDDATA

@FOR( TASKS( J)| J #GT# 1:
 ES( J) = @MAX( PRED( I, J): ES( I) + TIME( I))
);

@FOR( TASKS( I)| I #LT# LTASK:
 LS( I) = @MIN( PRED( I, J): LS( J) - TIME( I));
);

@FOR( TASKS( I): SLACK( I) = LS( I) - ES( I));

ES( 1) = 0;
LTASK = @SIZE( TASKS);
LS( LTASK) = ES( LTASK);

END