The majority of testing projects, both for sites in development before launch and websites being audited after launch, will utilise multiple testing types.
For example, testing will often include functionality testing, browser compatibility testing and mobile testing at the minimum, with usability testing, accessibility testing and SEO testing being optional items.
Test planning is also optional and generally reserved for larger scale projects where specific test requirements need to be met and a more structured approach for conducting the testing and reporting results is needed.