LOGIC PUZZLE Definitions ES Early Start blue box topleft cor

LOGIC PUZZLE

Definitions:

ES Early Start (blue box top-left corner)

EF Early Finish (blue box, top-right corner)

LS Late Start (blue box, bottom-left corner)

LF Late Finish (blue box, bottom-right coner)

STF Start Total Float (yellow box, left-center)

FTF Finish Total Float (yellow box, right-center)

DUR Duration (pink box, bottom-center)

NET Not Earier Than Date Constraint (missing value indicated by underline)

NLT Not Later Than Date Constraint (missing value indicated by underline)

SS Start-to-Start (gray box; missing value indicated by blank rectangle)

FF Finish-to-Finish (gray box; missing value indicated by blank rectangle)

Instructions:

Use your powers of reasoning - along with your understanding of the mechanics of the Critical Path Method - to determine the missing values. When fully completed, each activity should have seven values: ES, EF, LS, LF, STF, FTF, and DUR.

Also watch out for relationship value, both the relationship type (either SS or FF) and the relationship duration. There are also three missing date constraint values.

Solution

Definitions for Critical Path Method :-

(1) ES (Early Start) :- The Earliest start time (E) for an activity represents the time at which an activity can begin at the earliest. It assumes that all the preceding activities start and finish at their earliest times.

(2) EF (Early Finish) :- The earliest finish time is calculated by sum of Earliest Start time plus t_ij,

T_EF = E + t_ij

where t_ij is the duration for activity i - j.

(3) LS (Late Start) :- It is defined by sum of Latest finish time minus t_ij.

T_LS = L - t_ij,

where t_ij is the duration for activity i - j.

(4) LF (Latest Finish time) :- It represent the latest by which an activity must be completed in order that the project may not be delayed beyond its targeted completion time.

(5) TF (Total Float ) :- It is the difference between the maximum time available to perform the activity and the activity duration. The maximum time available for any activity is from the earliest start time to the latest completion time.

(6) STF (Start Total Float) :- It represents the starting of total float. yellow box in left center as shown in fig.

(7) FTF (Finish Total Float) :- It represents the finishing of total float, yellow box in right center as shown in fig.

(8) DUR (Duration) :- Duration represents the time required for activity i to j.

(9) NET (Not Earlier Than Date Constraint) :- It means that the process could not be start earlier than date constraint.

(10) NLT (Not Later Than Date Constraint) :- It means that the process start before that date constraint. It could not be start later than date constraint.

(11) SS (Start to Start) :- It represent the total process when it start to next process start.

(12) FF (Finish to Finish) :- It represnt the total process from ending of one process to finish of second process.