Group B — Descriptive Questions (5 marks)

The System Concept

The system concept views an organization as an integrated set of interrelated components working together to achieve objectives. A management system has four key parameters:

• Inputs: Raw materials, labor, capital, information, energy from the environment
• Transformation Process: Operations converting inputs to outputs (manufacturing, assembly, services)
• Outputs: Finished products, services, profits, waste
• Feedback: Information about output quality and quantity used to control and improve the system

Variables include controllable variables (production rate, workforce size) and uncontrollable variables (market demand, raw material prices). System behavior is the response of the system to inputs and environmental changes.

Four Essential Functions

PLANNING: Setting organizational objectives and deciding the best course of action. In manufacturing: production planning, capacity planning, demand forecasting, budget preparation. Planning answers WHAT to produce, HOW to produce, and WHEN.

ORGANIZING: Arranging resources (people, machines, materials) and creating structure to implement plans. In manufacturing: department creation, job design, assigning roles, plant layout, resource allocation.

DIRECTING: Guiding, motivating, and supervising employees. In manufacturing: issuing instructions, leading teams, resolving conflicts, motivating through incentives and performance management.

CONTROLLING: Measuring actual performance against standards and taking corrective action. In manufacturing: quality inspections, production monitoring, variance analysis, efficiency measurement.

Key Factors

• OBJECTIVES: Structure must align with organizational goals
• ENVIRONMENT: Stable environments allow rigid structures; dynamic ones need flexibility
• TECHNOLOGY: Mass production favors functional structure; custom work favors matrix
• SIZE: Larger organizations need more formalization and decentralization
• STRATEGY: Differentiation strategy needs decentralization; cost leadership needs centralization
• PEOPLE: Skilled employees need less supervision (wider span of control)
• CULTURE: Shared values influence structure design
• RESOURCES: Availability of capital, technology, and skilled personnel

Span of control is the number of subordinates a manager can effectively supervise. Significance: Determines hierarchy levels, affects communication speed, influences management costs, impacts employee autonomy and job satisfaction.

TALL STRUCTURE (Narrow span — 5-6 subordinates): Close supervision, better control, clear career paths. But: slow communication, high costs, employee frustration. Suitable for complex, non-routine work.

FLAT STRUCTURE (Wide span — 15-20+ subordinates): Fast communication, low costs, employee empowerment. But: overburdened managers, less supervision, role ambiguity. Suitable for routine, standardized work with capable employees.

Modern trend favors flatter structures due to communication technology and the empowerment philosophy.

When Decentralization is Preferred

• Organization is large and geographically dispersed
• Operations are complex and diverse across departments
• Need for quick local decisions to respond to market changes
• Desire to develop lower-level managers through empowerment
• Top management wants to focus on strategic issues only
• Emergency situations requiring rapid response at local level

Delegation is the transfer of authority from superior to subordinate to perform specific tasks. Three elements: (1) Responsibility — duty to perform; (2) Authority — power to act; (3) Accountability — obligation to answer for outcomes.

Why Accountability is Retained

• The superior remains ultimately answerable to higher management for outcomes
• If the subordinate fails, the superior is still responsible
• Accountability flows upward — cannot be transferred downward
• Delegation = sharing workload; Accountability = cannot be transferred
• The superior must still monitor, guide, and support the subordinate

Example: A production manager delegates scheduling to a supervisor. If targets are missed, the production manager — not the supervisor — is accountable to the plant manager.

Factors Influencing Climate

Leadership style, communication patterns, reward systems, physical work environment, interpersonal relationships, job security, participation in decision-making, and organizational structure.

Generally, high morale leads to higher productivity through: increased motivation and voluntary effort, lower absenteeism and turnover, better teamwork, and willingness to accept change.

Is High Morale ALWAYS Accompanied by High Productivity?

NO — the relationship is positive but not automatic:

• Workers may be happy with LOW productivity if standards are low
• Morale may be high due to social relationships, not work motivation
• Skills/ability limitations may prevent high output despite good attitude
• Poor equipment or processes may limit productivity regardless of morale

Conclusion: Morale is a necessary but NOT sufficient condition for productivity. Productivity also depends on skills, tools, processes, and management practices.

• Work itself: Meaningful, challenging, skill-appropriate tasks
• Pay and benefits: Fair compensation relative to effort and market rates
• Working conditions: Safe, clean, comfortable environment, reasonable hours
• Supervision: Supportive, fair, competent managers who provide feedback
• Relationships: Positive relationships with coworkers and supervisors
• Advancement: Opportunities for promotion, career growth, training
• Job security: Stability of employment
• Participation: Involvement in decisions affecting work
• Recognition: Acknowledgment of good work — praise, awards, appreciation

Health (Sections 18-27)

Cleanliness, ventilation, lighting (minimum 1 foot-candle), drinking water, latrines (separate for males/females), and overcrowding limits (500 cu ft per worker).

Safety (Sections 28-40)

Fencing of dangerous machinery, emergency stop devices, hoists and lifts (regular examination, safety valves), pressure vessels (certified), and fire safety equipment.

Welfare (Sections 41-50)

First-aid boxes and trained first-aiders, canteens for 250+ workers, rest rooms and lunch rooms, crèches for women with children (50+ women workers), and proper washing facilities.

Working Hours

Adult workers: Maximum 48 hours/week, 9 hours/day. One weekly holiday mandatory. Overtime at twice the ordinary rate. At least 1 hour rest interval when work exceeds 5 hours continuously.

Young Persons

Children (14-15 yrs): Maximum 4.5 hours/day, NO night work (10 PM to 6 AM prohibited). Adolescents (15-18 yrs): Maximum 4.5 hours/day if certified fit, max 48 hours/week. Certificate of fitness mandatory. Certain dangerous occupations are prohibited.

Annual Leave

Adult workers: 1 day for every 20 days worked (~12 days/year). Young persons: 1 day for every 15 days worked (~14 days/year). Leave must be granted with full wages. Cannot be denied except on reasonable grounds.

(i) EVENT (Node): A point in time marking START or COMPLETION of activities. Represented by a CIRCLE. Does NOT consume time or resources.

(ii) ACTIVITY: A task consuming time, resources, and effort. Represented by an ARROW with a defined duration.

(iii) DUMMY ACTIVITY: Imaginary dotted arrow. Does NOT consume time or resources. Used to show correct dependencies. Never numbered.

(iv) PREDECESSOR/SUCCESSOR: Predecessor = activity that must complete before another starts. Successor = activity that follows another. Every activity (except first) has at least one predecessor.

(v) NETWORK RULES: (a) Every activity starts from and ends at events; (b) No two activities share same start-end events unless one is dummy; (c) No activity starts until predecessor completes; (d) ONE start event and ONE end event.

EPO (Earliest Possible Occurrence) — also called Earliest Event Time (EET) — is the earliest time an event can occur, calculated by FORWARD PASS starting from initial event (EPO = 0):

$\text{EPO} = \max(\text{EFT of all activities ending at that event})$

LPO (Latest Possible Occurrence) — also called Latest Event Time (LET) — is the latest time an event must occur without delaying the project, calculated by BACKWARD PASS from the final event (LPO = project duration):

$\text{LPO} = \min(\text{LST of all activities starting from that event})$

Critical events have EPO = LPO. The difference (LPO − EPO) is the event slack. Events with zero slack are on the critical path.

TOTAL FLOAT (TF): Maximum delay without delaying project completion.

$\text{TF} = \text{LST} - \text{EST} = \text{LFT} - \text{EFT}$

Shared among activities on the same path. Critical activities have TF = 0.

FREE FLOAT (FF): Maximum delay without delaying the EARLIEST start of any successor.

$\text{FF} = \text{EST}(\text{successor}) - \text{EFT}(\text{current})$

Independent of other activities' delays.

INDEPENDENT FLOAT (IF): Portion of total float exclusive to one activity.

$\text{IF} = \text{Total Float} - \text{Free Float}$

IF is available only when preceding activities finish at earliest AND succeeding activities start at latest — it is the "private" float of an activity.

Network Crashing

Shortening project duration by allocating additional resources to critical activities at increased cost. Goal: find optimum project duration at minimum total cost.

Cost Trade-off

DIRECT COSTS (crash costs) INCREASE as duration decreases — more resources = higher cost/day. INDIRECT COSTS (overhead) DECREASE as duration decreases — shorter project = fewer overhead days.

$\text{Total Cost} = \text{Direct Cost} + \text{Indirect Cost}$

The optimum duration is at the minimum point of the total cost curve. Crashing rule: always crash the critical activity with the lowest cost slope by one unit at a time, then recalculate the critical path.

$\text{Cost Slope} = \frac{\text{Crash Cost} - \text{Normal Cost}}{\text{Normal Time} - \text{Crash Time}}$

Procedure

1. Record Actual Progress: Document actual start/finish times of completed activities
2. Revise Time Estimates: Update EST/EFT/LST/LFT for remaining activities
3. Identify New Critical Paths: Delays may create new critical paths
4. Forecast Completion: Calculate revised expected completion date
5. Reallocate Resources: Adjust resource allocation based on updated priorities
6. Communicate Changes: Inform stakeholders of schedule revisions
7. Take Corrective Action: Implement measures to bring project back on track

Industrial Applications

Construction project tracking, software development monitoring, product development phase tracking, plant maintenance scheduling (shutdowns), large-scale event coordination, and infrastructure project management (highways, bridges).

Scope

Covers the entire materials flow — procurement, transportation, storage, inventory control, and distribution. Includes raw materials, components, spare parts, tools, consumables.

Functions

• Planning: Forecasting material requirements, setting inventory policies
• Purchasing: Supplier selection, negotiation, order placement, follow-up
• Storekeeping: Receiving, storing, issuing, maintaining inventory records
• Inventory Control: EOQ, reorder points, ABC analysis, safety stock
• Materials Handling: Transportation within plant, packaging, unit load design
• Salvage and Disposal: Scrap handling, obsolete material disposal
• Standardization: Codification, variety reduction, value analysis

Importance in Cost Reduction

Materials constitute 50-70% of product cost. Effective materials management reduces costs through: better purchasing terms and bulk discounts, reduced carrying costs via inventory optimization, prevention of losses from theft/damage/obsolescence, efficient storage and handling, and supplier relationship management.

1. PURCHASE REQUISITION: Department submits form specifying item, quantity, quality, date needed, authorized signature — triggers the purchase process
2. PURCHASE ENQUIRY: Purchasing dept sends enquiries to approved suppliers for quotations
3. QUOTATION RECEIPT: Suppliers submit price quotations, delivery terms, payment conditions
4. QUOTATION COMPARISON: Compare on price, quality, delivery, payment terms, supplier reliability
5. SUPPLIER SELECTION: Best supplier selected based on total evaluation (not just lowest price)
6. PURCHASE ORDER (PO): Formal order with item details, quantity, price, delivery date, terms
7. ORDER ACKNOWLEDGMENT: Supplier confirms acceptance — discrepancies resolved
8. MATERIAL RECEIPT: Goods received, physically inspected for quality and quantity
9. GOODS RECEIVED NOTE (GRN): Storekeeper prepares GRN acknowledging receipt
10. INVOICE VERIFICATION: Three-way matching — invoice vs PO vs GRN
11. PAYMENT: Payment processed as per agreed terms
12. RECORD KEEPING: All documents filed for audit and future reference

BIN CARD: Card attached to each storage bin showing quantity of a specific item. Records: item name, bin number, receipts, issues, balance. Updated AFTER EACH TRANSACTION. Physical/quantitative record at the bin level.

STORES LEDGER: Formal accounting record (like a ledger account) for each item. Shows the monetary value (quantity × price). Updated periodically (daily/weekly). Financial/accounting record.

GOODS RECEIVED NOTE (GRN): Document acknowledging receipt of materials. Contains: date, supplier, PO number, item description, quantity received, condition, received by signature. Sent to accounts for payment.

ISSUE REQUISITION: Document requesting materials from store. Prepared by the using department. Contains: item, quantity, purpose/job number, date required, authorized by department head.

Need for Codification

• Eliminates confusion from similar names for the same item
• Simplifies and speeds up record-keeping and retrieval
• Enables computerization of inventory systems
• Standardizes naming across departments
• Facilitates classification (ABC, VED, SDE analysis)
• Reduces storage and handling costs through systematic arrangement

Comparison

Let: $D$ = Annual demand (units/year), $O$ = Ordering cost per order (Rs.), $H$ = Carrying cost per unit/year (Rs.), $Q$ = Order quantity.

Total Ordering Cost: $\frac{D}{Q} \times O$ (number of orders × cost per order)

Total Carrying Cost: $\frac{Q}{2} \times H$ (average inventory × carrying cost per unit)

Total Cost Function:

$\text{TC} = \frac{D \cdot O}{Q} + \frac{Q \cdot H}{2}$

Minimize TC: Differentiate w.r.t. $Q$ and set to zero:

$\frac{d(\text{TC})}{dQ} = -\frac{D \cdot O}{Q^2} + \frac{H}{2} = 0$

$Q^2 = \frac{2DO}{H} \implies \text{EOQ} (Q^*) = \sqrt{\frac{2DO}{H}}$

At EOQ, Ordering Cost = Carrying Cost — this is where total inventory cost is minimized.

Procedure

1. Calculate Annual Usage Value = Unit Cost × Annual Consumption for each item
2. Rank items in descending order of usage value
3. Calculate cumulative % of items and cumulative % of value
4. Classify into A, B, C categories

Classification (Pareto Principle)

• A-ITEMS: ~10% items = ~70% value — TIGHT CONTROL
• B-ITEMS: ~20% items = ~20% value — MODERATE CONTROL
• C-ITEMS: ~70% items = ~10% value — LOOSE CONTROL

Management Control Policy

Two-Bin System

Stock in two bins. Consume from Bin 1 first. When Bin 1 is EMPTY: (1) Order placed for EOQ quantity, (2) Shift to Bin 2 (contains lead-time stock). When Bin 2 is empty, new order arrives and refills Bin 1. Simple visual reorder mechanism.

Wilson's Model

A continuous review system. When inventory position reaches Reorder Point, order fixed quantity (EOQ). Inventory follows sawtooth pattern from EOQ down to safety stock, then jumps back to EOQ.

$\text{ROP} = \text{Lead Time Demand} + \text{Safety Stock}$

Concept

MRP-I is a computer-based system calculating material requirements from MPS and BOM. Objectives: Ensure materials available when needed, minimize inventory, coordinate manufacturing/purchasing/delivery.

Working Mechanism

1. Input Master Production Schedule (MPS) — what to make, when
2. Input Bill of Materials (BOM) — component structure
3. Input Inventory Status File — current stock levels
4. Explode BOM → calculate gross requirements
5. Calculate net requirements = gross − available stock
6. Generate planned order releases and purchase orders

Popular MRP Software

SAP R/3, Oracle JD Edwards, Microsoft Dynamics GP, Ramco ERP, Infor ERP, Epicor ERP, NetSuite ERP, IFS Applications, MFG/PRO.

Need

Manufacturing involves complex coordination of men, machines, materials, and methods. Without PPC, production would be chaotic, costly, and unable to meet delivery commitments.

Importance

• Ensures timely delivery to customers
• Maximizes resource utilization
• Minimizes inventory costs (WIP and finished goods)
• Enables cost control and efficiency measurement
• Provides data for managerial decision-making
• Coordinates between design, production, marketing, and finance

Eight Core Functions

1. ROUTING: Path/sequence of operations for each job
2. LOADING: Assigning work to machines/operators
3. SCHEDULING: Fixing start/finish times for operations
4. DISPATCHING: Releasing orders and materials to shop floor
5. EXPEDITING: Tracking progress, removing bottlenecks
6. INSPECTION: Quality checking at production stages
7. EVALUATING: Comparing actual vs planned performance
8. CORRECTIVE ACTION: Addressing deviations and replanning

ROUTE SHEET: Specifies complete sequence of operations — operation number, description, machine/tool, standard time, special instructions. Prepared by routing section. Tells WHERE and IN WHAT SEQUENCE the job should be processed.

WORK ORDER: Authorization to manufacture a specific quantity. Contains: product specification, quantity, delivery date, customer name, BOM reference. Prepared by planning department. Legal authorization to start production.

JOB CARD: Issued to individual workers for a specific job. Contains: job details, operations, time allowed, tools, quality requirements, special instructions. Prepared by dispatch section. Worker's work instruction.

MOVE ORDER: Authorizes movement of materials between workstations. Contains: item, quantity, source, destination, date required, transport instructions. Prepared by production control. Ensures materials reach the right place at the right time.

A Gantt Chart is a horizontal bar chart: Horizontal axis = time, Vertical axis = jobs/machines, Bars = duration of each job. Two types:

• Loading Chart: Shows machine occupancy by jobs — identifies idle times and overloads
• Progress Chart: Shows planned vs actual bars — deviation indicates delays

Gaps in bars indicate idle time. Overlapping bars indicate machine overload.

$\text{CR} = \frac{\text{Due Date} - \text{Current Date}}{\text{Processing Time Remaining}}$

Sequencing Rule: Process jobs in ASCENDING order of CR (lowest CR first). Jobs with CR = 0 are critically overdue — need emergency action.

Definition

A bottleneck is the slowest/most constrained stage limiting the throughput of the entire system. According to Goldratt's Theory of Constraints, the throughput of ANY system is determined by its bottleneck.

Adverse Effects

• Reduced overall output/capacity of the entire system
• Accumulation of WIP inventory before bottleneck — increased holding costs
• Idle time at downstream stages waiting for bottleneck output
• Increased lead time for customers — longer delivery times
• Higher costs due to waiting, storage, and handling

4 Methods to Eliminate

1. Increase capacity at bottleneck — add shifts, extra machines, skilled workers
2. Reduce workload on bottleneck — subcontract overflow, add parallel lines
3. Improve efficiency at bottleneck — eliminate waste, SMED, better scheduling, preventive maintenance
4. Buffer management — add buffer inventory before bottleneck to prevent starvation

Value Analysis (VA) is a systematic, function-oriented approach to analyzing product functions to achieve required function at LOWEST TOTAL COST without compromising quality. Value Formula: $V = F/C$ where $V$ = Value, $F$ = Function, $C$ = Cost.

VA vs VE

Types of Value

• Use Value: Functional utility — ability to perform intended function
• Esteem Value: Prestige, brand value — what makes product desirable beyond utility
• Exchange Value: Trade/market value — resale value, scrap value
• Cost Value: Monetary cost to produce the product

1. INFORMATION: Gather all data — specifications, costs, quantities, suppliers, usage patterns
2. FUNCTION ANALYSIS: Identify ALL functions (primary and secondary) in verb-noun format
3. CREATIVE: Brainstorm alternative ways to perform each function — no idea too wild
4. EVALUATION: Evaluate alternatives on cost vs function — select most promising
5. INVESTIGATION: Develop selected alternative into detailed proposal with cost estimates
6. RECOMMENDATION: Present to management with cost savings and implementation plan
7. IMPLEMENTATION: Execute approved changes — design, vendor, process modifications
8. FOLLOW-UP: Monitor results, verify savings, ensure function maintained

DARSIRI is a 7-step VA methodology:

1. DATA GATHERING: Collect drawings, costs, quantities, suppliers, usage data, failure history
2. ANALYSIS: Identify all functions, costs, relative importance — use function analysis charts
3. RESEARCH: Explore alternatives — new materials, designs, suppliers, processes, competitors' solutions
4. SOLUTION: Select best alternative(s) that maintain function at lower cost
5. IMPLEMENTATION: Design changes, vendor qualification, process modifications, trial runs
6. REVIEW: Evaluate results — did savings materialize? Was function maintained?
7. INSPECTION: Audit results, verify quality standards, document lessons learned

Types of Waste (Muda)

• Transport: Unnecessary material movement between processes
• Inventory: Excess raw materials, WIP, or finished goods
• Motion: Unnecessary worker/equipment movement
• Waiting: Idle time of workers or machines
• Overproduction: Making more than needed (worst waste)
• Over-processing: Unnecessary features or operations
• Defects: Rework, scrap, rejects

Cost Control Guidelines

• 5S: Sort, Set in order, Shine, Standardize, Sustain
• JIT: Reduce inventory through pull-based production
• Kaizen: Continuous small improvements from all employees
• TPM: Preventive maintenance to maximize equipment effectiveness
• Standard Costing & Variance Analysis: Set standards, measure actuals, analyze variances
• Value Analysis: Systematically eliminate unnecessary features
• Energy Efficiency: Monitor and reduce energy consumption

ERP is an integrated software suite managing core business processes using a single shared database and common interface, replacing disparate legacy systems.

Architecture

• Presentation Layer: User interface (web, mobile, dashboards)
• Application Layer: Business logic, modules, workflows
• Database Layer: Centralized database — single source of truth
• Integration Layer: APIs, middleware for external systems (MES, CRM, IoT)

Major Modules

Benefits

Real-time data for MES integration, automated material tracking, synchronized production scheduling, reduced paperwork, better demand forecasting, compliance tracking.

• WBS: Hierarchical task decomposition into phases, tasks, subtasks
• Gantt Chart: Visual timeline with task durations, dependencies, milestones, critical path
• Critical Path: Automatic identification with total float calculation
• Resource Leveling: Smooths resource usage by delaying non-critical tasks to prevent over-allocation
• Baseline Planning: Saves original plan for progress comparison (SV, CV)
• Tracking: Enter actual progress, auto-recalculates remaining durations
• Reports: Burndown charts, earned value (EV, PV, AC, SPI, CPI), resource utilization
• Collaboration: Integration with Teams and SharePoint for team communication

(a) JIT Manufacturing

JIT produces only what is needed, when needed, in the quantity needed — eliminating all waste. Key principles: Pull system (Kanban cards trigger production), zero/lean inventory, continuous flow (one-piece preferred), quality at source (jidoka), close supplier relationships with small frequent deliveries. Benefits: reduced carrying costs, improved quality, shorter lead times, reduced floor space. Example: Toyota Production System.

(b) Logistics & SCM

SCM manages the entire chain from raw material suppliers to end customers — planning and controlling all flows (materials, information, finances). Logistics is the operational execution — transportation, warehousing, inventory management, order fulfillment. Benefits: reduced total costs, improved customer service, better coordination, risk reduction through visibility, competitive advantage through speed, real-time tracking via IoT, sustainable practices.