Classify each requirement as “mandatory”, “optional”, or “no common view within group”

Requirement	C1	S1	X2	S2	H1	V1	V2	W1	W2
Simplicity of use	m	m				m	m	m
Big user community	m	o				m	m	o
Little support necessary	m	m				m	m	m
Mathematical formulas	m	n				?	m	m
Multilingual (E,D,F,I)	m	m				m	m	m
Modular software	m	m				?	o	m
Technical assistance	m					m	o	m
Variable layout (skins)	m					m	o	m
Communication	m					m	m	m
Group support	o					?	o	m
Community support	m					?	o	m
Printer friendly	o					m	o	m
Data repository	m					?	o	m
Easy course enrolment	m					m	m	m

Legend:
C1: Crettenand
S1: Schiltz
S2: Sommer
H1: Hauck Hofer
V1: Vignoli
V2: Vögeli
W1: Wenk
W2: Willi
m: mandatory
o: optional
n: no common view within group

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