1. Software quality: most important: meet spec; other general ones: user friendly, efficiency, robustness, reliability, support
Rapid prototyping: quickly build summarizations reflect main func in order to communicate with clients/peers embedded in wf model
pros: better comm; better response/feedback
cons: invite more moving targets,
Wf+rp
Evolution: simplecomplex: system having ind. components
partition system into many builds:
Ccny mis: std + fac + lib + funding 2yrs
std(water fall+ proto): 8 months stop reduce risk
Pros: reduce overall risk,
Cons: fatal blow—hard to integrate, have to redo design/coding
Spiral model: military huge system
water fall + risk analysis at the end of each phase, Bayesian reasoning example
Pros: safety ; cons: very expensive
Pros and cons of these models

2. View-point oriented analysis: all angles/perspectives should be exhausted
recs: system boundary, ovals: funcs, users: ord left side; privileged right side
use-case diagrams: UML unified modeling language (CASE)
Finite state machine (FSM): represent logic
initial state-circle with an arrow, final state(s): double-edged circle, intermediate states: plain circles;
tokens or alphabets to be handled for every state
transitions: transfer to next state given certain token - must exhaust all tokens for each state
As a valuable pattern recognizer such as fixed (binary) patterns or variable of certain features (remainder)