Petach 68 offers an overview of the process and its goal in a straightforward way.
It says that all the parts that ascend, their degrees of ascent, and their ways of interconnecting  are exactly what’s needed to make this world the way it needs to be made in the course of the Tikkun process — with just the right number of reparations, of deficiencies, and of processes needed to complete the cycle of Divine governance and to lead to the revelation of God’s Yichud.
 See Ramchal’s own comments here as well as Eitz Chaim Sha’ar Zeir Anpin 3 and Sha’ar Attik 2 for details.
(c) 2014 Rabbi Yaakov Feldman
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Rabbi Yaakov Feldman has also translated and commented upon “The Path of the Just” and “The Duties of the Heart” (Jason Aronson Publishers).