Higher level design concepts.
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https://en.wikipedia.org/wiki/Engineering_change_order (ECO)
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Clock Tree Synthesis (CTS)
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Macros: http://asic-soc.blogspot.co.uk/2007/11/what-is-difference-between-soft-macro.html Hard macro looks like a custom hand-written per-project cell.
There are also netlist level macros (firm macros), and soft macros (just plain RTL).
Multi mode multi corner (MMMC).
Worst Case Low temperature (-40C): http://decemberyork.blogspot.co.uk/2016/02/mmmc-multi-mode-multi-corner.html