If you have more than one explanation to choose from, the best explanation is the simplest one
Complex explanations often bring in extra ideas, new concepts or expect us to believe in new things
Simple explanations work with what we already know and avoid proposing anything new or untested
Occam's Razor can be used to criticise the Design Argument
Because faced with something that needs explaining (order and complexity in theuniverse), the Design Argument brings in something else that needs explaining - an all-powerfulDesignerGod
This is "multiplying entities unnecessarily" and goesagainstOccam'sRazor
If God is simple
Occam'sRazor actually supports God as the best explanation
If God is not simple
Occam'sRazor is devastating for the Design Argument
Soundness
The claim premises of the argument are factuallytrue
The universe only shows the appearance of design, not actual design
The Theory of Evolution is an alternativeinterpretation of apparentdesign in living things
Apparent design in chemistry and physics may also have a naturalistic, rather than a supernatural, explanation
"Design is always the product of an intelligent agent" is challengedbyevolution
This links to Occam's Razor
Suggesting that, however improbable it is for design to comeabout through unintelligentcauses, an explanation like "God" may be even moreimprobable
Dysteleological argument

Rejecting the Design Argument by pointing out the flaws and imperfections in the naturalworld
The natural world suggests its Designer must be incompetent or evil, instead of showing signs of an all-wise, all-powerful and benevolentDesigner God