operation management

what is the missing info!!

Answer the case given below: Abbas Engineering is doing job shop services. Over the past 10 years, it has served so many clients. Mr Abdulla, who handles the job shop scheduling is following the system which has been used for the past years. The elders who used to handle the operation processed the customer requirement based on how they arrive in the shop. However, over the past years, customers are complaining for failure to complete the jobs on the required time. With this, Mr Abdulla thought of hiring expert who can improve the performance of the company. The first applicant, Mr Hashim is proposing to use Johnson's rule in improving the completion time and reducing the idle time. The 2nd applicant, Mr Hussain is proposing to use the First Come First Serve basis in processing customer requirements. Each job needs to be processed in 2 work centers A and B. With the data provided below: Client Work Center A ( days) Work Center B( days) 6 B 7 2 1 la 2 3 E F 5 4 a. If Johnson's rule as being pushed by Mr Hashim, what will be the completion time and idle Time. (3 pts for the sequence, 5 pts for the diagram, 2 pts for the completion time and 3 pts for the idle time) b. If Mr Hussain's suggestion will be followed, what will be the completion time and idle Time ( 3 pts for the sequence, 5 pts for the diagram, 2 pts for the completion time and 3 pts for the idle time) c. If you will be given the chance to recommend between the two applicants, whom will you recommend and why and on what basis have you arrived at that recommendation (10 pts)