Table 2. The number of articles on citizen science projects broken into their typologies groups from 1997 to 2014.

Typology	1997–1999	2000–2002	2003–2005	2006–2008	2009–2011	2012–2014	All Years
Action	0	0	0	2	3	0	5
Conservation	0	2	4	6	13	51	76
Investigation	2	0	8	12	45	187	254
Virtual	0	0	0	1	9	42	52
Education	1	1	0	1	8	20	31
Total	3	3	12	22	78	300	418