fsm
FSM usually means a finite state machine, a way to design systems that can only be in one state at a time. People use it to describe anything with clear steps, like a traffic light or a checkout flow.
What a model may hear
- finite state machine computer science and formal methods
- assume a formal model with states, transitions, and deterministic or non-deterministic behavior
- feature selection method machine learning and statistics
- treat it as a technique for choosing variables in a model
- file system mount Linux and Unix systems
- expect a command or configuration related to mounting storage
- fuzzy state machine game AI and robotics
- assume probabilistic or blended transitions between states
Where people and models part ways
“build me an FSM for my app”
Meant: a simple flowchart of screens or user steps
May be taken as: generate formal code with explicit state tables, transition matrices, and event handlers that over-engineer the solution
Say instead: “build me a simple step-by-step flow with clear states like draft, review, and published”
“the FSM is broken”
Meant: my workflow has a logic error
May be taken as: debug formal automata theory, check for unreachable states or non-determinism, or ask for state transition diagrams
Say instead: “my multi-step process gets stuck between two stages and does not advance”
“use FSM to pick features”
Meant: choose the best variables for my model
May be taken as: implement a finite state machine for feature engineering rather than statistical selection methods
Say instead: “use a feature selection method like recursive feature elimination or mutual information”
“add FSM support”
Meant: let users save and resume their progress
May be taken as: add a full state machine framework with events, guards, and actions
Say instead: “let users pause and resume their work, tracking which step they left off on”
Tips
- Say 'step-by-step flow' or 'stage tracker' if you do not need formal state machine code
- Mention the domain, like 'game AI' or 'formal verification', to narrow which FSM you mean
- Specify deterministic or non-deterministic if you know the formal type you need
- Ask for a diagram or pseudocode first if you want to check the complexity before full implementation
- Distinguish FSM from workflow engine or rules engine if you need persistence or human approval steps
Often confused with
- state machine
- same meaning, more explicit
- workflow engine
- adds persistence, timers, and human tasks
- rules engine
- uses conditions and actions, not explicit states
- HMM
- hidden Markov model, adds probabilistic hidden states
- behavior tree
- hierarchical task decomposition, not flat state transitions
- Turing machine
- more powerful, has a tape and full memory