Article Impact Index

The Article Impact Index (AII) is an indicator used at Iscte-Instituto Universitário de Lisboa to measure the impact of an article in the context of the Impact Factor of the journal in which the article is published. The AII is calculated as the ratio between the citations that the article has received up to this point and the total sum of the journal's impact factors from the year of publication up to the year before the current one (i.e. 2024). In case there is no data regarding the Impact Factor of the previous to the current one, we consider the same value of the Impact Factor of the year previous to the one missing.

It is only possible to calculate the AII for articles in indexed journals published up to the year before the current one (i.e. 2024). And for those cases, it is also necessary that the Impact Factor values exist for all the years between the publication year and the year before the current one (i.e. 2024).

Let us check this publication example:

Title Fifty Seychelles warbler (Acrocephalus sechellensis) microsatellite loci polymorphic in Sylviidae species and their cross-species amplification in other passerine birds
Year 2000
Web of Science® Scopus (Scimago)
Citations 181 171
Sum of Impact Factors
2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 Total
2.769 2.478 3.014 3.87 4.375 4.301 4.825 5.169 5.325 5.96 6.457 5.522 6.275 5.84 6.494 5.947 6.086 6.131 5.855 5.163 6.185 6.622 4.9 4.5 3.9 128.0
2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 Total
2.86 2.69 3.11 3.98 4.46 4.58 4.93 5.35 5.23 5.8 6.11 5.25 5.87 5.46 6.06 5.79 5.55 5.7 5.39 4.88 5.06 5.51 4.94 4.69 4.14 123.4
AII Calculation 181 / 128.0 = 1.4 171 / 123.4 = 1.4
Article Impact Index 1.4 1.4