  First, unless anybody as any objections, I will delete the top part of this discussion, because we have started a new thread. This should make scrolling, and therefore the entry of new contributions, easier.  == Response to Merge Suggestion == Rather than merge DAL into this article, would it be more appropriate to do one or more of the following:  • Merge it into the Scientific or Programmable calculator articles.  • Make a separate article called Button-operated calculator, that covers DAL and other input modes, different notations, as well as various example software calculators, including those referenced in the article’s Hybrid calculators section.  • Include another reference to your simulator of a DAL calculator in the Hybrid calculators section. There is a reference (28) there to a calculator that has a choice of entry modes, including Precedence Mode, which is similar to DAL. == Response to NPOV comment ==  I can make it clearer what is being compared with what.  In the Examples section, a simple arithmetic, button-operated calculator is being compared with an FC. These are very common software calculators, and probably the most ubiqitous. For example, the following are calculators that don't have a choice of mode and that don't use DAL:  • The referenced calculator, M/S’s O/S arithmetic calculator accessory, which is possibly the most widely distributed calculator.  • The Moffsoft free calculator, which is one of the most downloaded calculators on the web.  • Mobile phone calculators (at least the one on my Nokia phone).  The article also references button-operated calculators that use Precedence Mode (without a choice, as with reference 28), and I have inadverently removed some comparisions with these as part of an earlier edit.  I will need more time to consider this, and I will post a few suggestions later. This will also help with the definition, and the differentiation between different types of operation.    