The phrase "asserts how" is correct and usable in written English.
It can be used when discussing the manner or method in which something is claimed or stated, often in academic or analytical contexts.
Example: "The author asserts how the new policy will impact the community's economic growth."
Alternatives: "claims that" or "states how".
"Step Up to the Plate" asserts how family, in multifarious ways, can be the most deeply affecting of ensembles.
And then there is also the presence of Justice Sonia Sotomayor, who while not black, openly asserts how her life experiences – that of a minority woman coming from an underprivileged background – adds value to the court.
He asserts how the Irish Independent first refused to publish Kelly's article on the impending collapse on the grounds it was offensive and how the PR department in his University College Dublin tried to hose him down by asking the head of the department of economics to "write a learned attack" on Kelly's piece, which was eventually published by the Irish Times.
On the Central Intelligence Agency's website today is an essay by a CIA historian Gerald K. Haines, which at its top asserts how "the Pike Committee set about examining the CIA's effectiveness and costs to taxpayers.
The second law of mechanics generalized the work of Galileo and Descartes on terrestrial dynamics, asserting how bodies generally move when they are subjected to external forces.
Major General Yossi Peled, one of the commanders who drafted the directive, told Haaretz that its purpose was to assert how far the military could go to prevent abductions.
If the system really discourages adaptive leadership, as Mr. Ricks asserted, how can it be relied on to produce a critical appraisal of its performance without external pressure?
Its scientists dug up anthrax bombs and prepared a detailed report that would explain, they asserted, how they disposed of 1.5 tons of deadly VX nerve gas in a dirt pit in 1991.
But you will have been amazed at many things, and perhaps even cry aloud a few times, asserting how much easier it would be to choose the second alternative in this franchise's title than the first.
Hedged with these qualifications, the declaration is merely symbolic, much like George W. Bush's letter to Ariel Sharon in April, 2004, which asserted how "unrealistic" it was to expect from Israel "a full return" to the 1967 borders.
Political etiquette requires potential vice-presidential picks to deny any interest in the post and assert how much they love their present job, all the while coyly batting their eyelashes at the nominee to signal their availability.
