Particle　packing　has　been　recognized　to　influence　mechanical　and　durability　properties　of　cementitious　materials,　which　are　generally　favored　by　optimum　packing　density.　Particle　size　is　a　common　denominator　in　such　studies.　Unfortunately,　so　far,　particle　shape　has　not　been　extensively　and　unambiguously　evaluated　in　these　approaches.　Part　of　it　is　definitely　due　to　the　interconnected　nature　of　size　and　shape　as　well　as　the　missing　of　a　clear　methodological　framework.　Nevertheless,　various　strategies　for　assessment　of　shape　are　available.　Capabilities　of　available　advanced　computer-simulation　systems　render　possible　considering　differentlyshaped　particles.　This　will　make　it　possible　studying　in　an　economic　way　the　effect　of　shape　on　properties　of　densely　packed　aggregate　or　binder　particles　at　low　w/c　ratios.　So,　shape　assessment　is　becoming　an　even　more　relevant　issue　in　structural　studies　of　concrete.　This　paper　presents　a　somewhat　underrated　approach　to　the　assessment　of　shape　of　(aggregate)　particles,　i.e.　Fourier　analysis.　A　new　shape　index　is　proposed.