NextStep

explain:
Finished work: + 
half worked: (+)
want:  
gave up: (_)

Client
	Student
		+learn Skill
		+list Skill what can learn(by color mode)
		+remove all progress
		+save progress in VCode
		+read progress in VCode
		forget Skill
		whan can't learn,list what need to learn
		add nickname
		(_)save progress in file
	Teacher
		+delete Skill (and delete all relation with this skill)
		+add skill
		+short key to add skill(ctrl + a)
		+delete relation
		+add relation
		+check relation
		+save dependency in file
		+save skill location in file
		+rename
		+right click to add succ // ºó¼Ì
		right click to add tail

UI
	+drag skill
	+flash
	+drag background
	+add arrow
	+change arrow
	+raname use moveable textBox not new Form
	+double click arrow to move to skill
	+no flicker
	+change the way draw arrow
	+scale map
	+scale map use more natural way
	+spin map
	+change font style
	+change color style
	+save color scheme in file
	+read color scheme in file
	+user design color scheme
	+user defined colorscheme
	+when scale too learge will srash
	remind save in file when close (*.dma)
	self-adaptation font size
	when some skill is out of windows, try to remind user where it is
	muti-tab page
	short key to flash
	add new DrawMode(selected)
	select a list of skill to move them or do other thing
	change arrow again
	add picture as background
	change Skill color like iMessage 
	in high resolution will flicker
	revoke some operation
	open scheme by more nature way

network
	temporary none

file encode
	temporary none

example
	+ACM 
	+MCT
	NumberTheory
	some math