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if ( is_page( array( 'about-us', 'contact', 'management' ) ) ) {
// either in about us, or contact, or management page is in view
} else {
// none of the page about us, contact or management is in view
}
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add_action('wp', 'init_func_for_test');
function init_func_for_test(){
// you can use page id , page slug, page title or if multiple pages then
// you can use array ['test','page-two',1254]
if(is_page('test'))
{
// your code here
}
}