Johnson\'s rule helps in sequencing of activities, thus enabling any project man

Question

Johnson's rule helps in sequencing of activities, thus enabling any project manager to understand the order of activities to be performed, to complete a task in most possible lesser time.

It is necessary to understand the logic involved in this rule. This rule tells us to identify, the least time taken among all activities listed, and arrange them in a sequence based on the machine/equipment order they fall into.

This rule can be applied only on a single task, which needs different machines or activities for completion.

So, in the above question, start identifying least time taken between Delta and Sigma among all jobs.

The least time is 10, and this pertains to last machine or equipment, Delta, so place letter R at the end of the sequence.

- - - - R

Next least time is 15 of job V, again from second machine or equipment, Delta, so place this letter again at the end of the sequence, without disturbing the earlier sequence

- - - V R,

Next least time taken is 20 of Job T, from the second machine/equipment, so place this letter at the end of the sequence, without disturbing the sequence,

- - T V R

Next least time is S from first machine/equipment, so place this letter at the beginning of the sequence,

S - T V R

Next least is again job S with time 30, however, as we have already taken this job in our sequence, we cannot repeat the same job again in our sequence, so next least in the table provided is 35 of job U from first machine/equipment Sigma, and also we have worked down from end to beginning, approaching towards the middle, and on now placing the letter in the sequence, we get,

S U T V R

and this is the possible sequence according to Johnson's rule, which will possibly reduce the time of all jobs.

Explanation / Answer

Five obs are waiting or processing through two work centers. Their processing time in minutes Johnson's rule, what sequence of jobs will minimize the completion time for all jobs? at each work center s contained n e able below. ach ob e es work enter Sg na re work center De ·According 40 10 50 35 20 35 15 OA. S-V-T-R-U OB, R-S-T-u-v OC. S-U-T-V-R O D. V-R-U-S-T OE. R-V-T-s-U

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