OS View: ''Resource Allocator'' vs. ''Control Program''.

''Graceful Degradation'' vs. ''Fault Tolerant''.

Dual Mode Operation: ''User Mode'' vs. ''Monitor Mode''.

Operating System Goal: ''Convenient'' vs. ''Efficient''.

''System Components'' vs. ''System Calls''.

''Operating System Components'' vs. ''Operating System Services''.

''Symetric Multiprocessing'' vs. ''Asymetric Multiprocessing''.

''Distributed Systems' vs. ''Clustered Systems''.

''Client Server System'' vs. ''Peer-to-peer system''.

''Microkernels'' vs. ''Virtual Machines''.

''Random Access Memory'' vs. ''Magnetic Disk''.

''Hard Real-time'' vs ''Soft Real-time''.

Job: ''Batch system'' vs. ''Time-Sharing System''.

System Design: ''Mechanism'' vs. ''Policy''.

Burst Cycle: ''I/O Burst'' vs. ''CPU Burst''.

Process Bound: ''I/O Bound'' vs. ''CPU Bound''.

''Process State'' vs. ''Process Control Block''.

''Waiting Time'' vs. ''Response Time''.

Process Type: ''Lightweight'' vs. ''Heavyweight''. .

Multithread Model: ''One to One'' vs. ''Many to Many''.

Scheduling Process: ''Short Term'' vs. ''Long Term''.

Scheduling Algorithm: ''FCFS (First Come First Serve)'' vs. ''SJF (Shortest Job First)''.

''Preemptive Shortest Job First'' vs. ''Non-preemptive Shortest Job First''.

Inter Process Communication: ''Direct Communication'' vs. ''Indirect Communication''.

Process Synchronization: ''Monitor'' vs. ''Semaphore''.

''Deadlock Avoidance'' vs. ''Deadlock Detection''.

''Deadlock'' vs. ''Starvation''.

Address Space: ''Logical'' vs. ''Physical''.

Dynamic Storage Allocation Strategy: ''Best Fit'' vs. ''Worse Fit''.

Virtual Memory Allocation Strategy: ''Global'' vs. ''Local Replacement''.

File Operations: ''Deleting'' vs. ''Truncating''.

Storage System: ''Volatile'' vs. ''Non-volatile''.

File Allocation Methods: ''Contiguous'' vs. ''Linked''.

Disk Management: ''Boot Block'' vs. ''Bad Block''.

I/O Data-Transfer Mode: ''Character'' vs. ''Block''.

I/O Access Mode: ''Sequential'' vs. ''Random''.

I/O Transfer Schedulle: ''Synchronous'' vs. ''Asynchronous''.

I/O Sharing: ''Dedicated'' vs. ''Sharable''. .

I/O direction: ''Read only'' vs. ''Write only''.

''I/O Structure'' vs. ''Storage Structure''.

Software License: ''Free Software'' vs. ''Copyleft''.