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Is a good dictionary enough?
or that's how we did it:
Practical English Usage success story.
The answer is definitely "NO", Paragon Software believes. The modern world is increasingly internationalized, and that brings new requirements for highly qualified professionals, including mastery of the world lingua franca to communicate successfully and perform various tasks within their fields. Modern professionals frequently cannot be just brilliant specialists in their business areas and highly advanced English speakers at the same time. In-depth study of any language is complicated and time-consuming, so Paragon Software has cooperated closely with Oxford University Press and highly-respected grammarian Michael Swan to consider the finer details of English language studies and transform the best-selling reference book for advanced-level learners into a quick and easy to use digital tool.
Development Stage 1: Deep data analysis.

Deals with spoken and written grammar, vocabulary, spelling, pronunciation, and differences between formal and informal language.

Contains over 600 indexed entries covering all the important problems for learners of English.

Offers clear, simple explanations with corpus-based examples.

Includes notes on background topics such as letters and emails, politeness, standardization and dialect grammar, the meaning of 'correctness', differences between spoken and written English, and changes in English.

Covers differences between British and American English.

“Swan’s ability to explain grammatical rules simply and clearly has won accolades from appreciative readers who value the way Practical English Usage provides answers to even the most challenging of students' questions. Practical English Usage has been a classic reference tool for many years, and we expect it to become the must-have app for all serious language learners and teachers.” Alison Waters, publisher for grammar at Oxford University Press

The printed book has proved its usefulness, but Paragon Software wanted to create a mobile app that would allow users to make certain queries and find absolutely exact answers in a flash, study new grammar rules and understand how they work in real language,
look through related topics, and at the same time enrich their vocabularies.

The printed book has proved its usefulness, but Paragon Software wanted to create a mobile app that would allow users to make certain queries and find absolutely exact answers in a flash, study new grammar rules and understand how they work in real language,
look through related topics, and at the same time enrich their vocabularies. Printed books provide language learners with a table of contents or an index, allowing them to quickly reach the page that will answer their question but mobile apps do not usually have pages at all. Furthermore, there are so many mobile devices these days, running a number of operating systems with their unique technology specifics, that Paragon Software wanted the app to be available for every language learner.

The software developers met this challenge by looking closely at the data structure and devising a deeply marked-up device-agnostic format that allows the use of mathematical algorithms to provide lightning-fast access to any word within the entire text of the printed book. This fact made us take a closer look at the data structure and elaborate a deeply marked-up device-agnostic format, which can by means of some mathematic algorithms provide lightning-fast access to any word (!!!) of the whole print book.

This mark-up covers topical headwords, examples, rules, language considerations (eg, regional specifics, indications) as well as many other factors.
<grammarEntry id= "Se308" ><title >kinds of English <⁄title ><subtitle>(1): standard English and dialects<⁄subtitle>
<section id= "unnumbered" >
<block >‘A language is a dialect that has an army and a navy.’ (Max Weinreich)<⁄block>
<section id= "unnumbered">
<block>‘Dialect: A language variety that has everything going for it, except the government, the schools, the middle class, the law and the armed forces.’ (Tom McArthur)<⁄block>
<section id= "Se308se01">< title>What is ‘standard English’?<⁄title>
<block>After King Alfred’s victory over the Vikings in 878, the government of Southern England came to be established in London, which later became the capital of the whole of Britain. Because of this, the English spoken in London and the East Midlands was gradually adopted as the ‘official’ variety of English. And as time went by, this dialect (and its later developments, profoundly influenced by Norman French), became the ‘standard’ language – the form of English generally accepted for use in government, the law, business, education and literature. Standard English, like all standard languages, is therefore largely the result of historical accident. If the Vikings, who held the north of England, had defeated Harold’s army, the capital of modern Britain might well be York, and this book would be written in (and about) a very different kind of English.<⁄block>
<section id= "Se308se02" >< title >What is a dialect?<⁄ title >
<block>Many people think that dialects are corrupted forms of a language, spoken by ignorant people who make mistakes because they have not learnt correct grammar. This is not at all true (for more about correctness, see 309< anchor id= "Se308se02a1" ⁄>). A standard language is not linguistically ‘better’ than other dialects; it is simply the dialect that has been adopted for official purposes such as government and education. All English dialects have a long history, going back to the distinct forms of speech of the Germanic and Scandinavian invaders who came from various parts of northern Europe to occupy Britain during the Middle Ages. And each of these dialects has a grammar that is as rich and systematic as standard English, even though it may be very different. Some examples of English dialect forms:<⁄block>
Development Stage 2. How should the information be presented on a small mobile device? Mobile platform integration.

Paragon Software has been developing and improving its proprietary cross-platform Slovoed dictionary technology for over a decade and brought this expertise to turn one of the world's most authoritative English reference tools into an app for iOS and Android smartphones and tablets.

The most advanced and fastest program shell on the market gave Swan's reference guide data:
— a very complete Index;
— the thematically-organized Contents Overview;
— the A-Z list of entries.

Each of these lists can be scrolled, or more conveniently searched by entering the keywords the user is interested in, e.g. future, conditionals, 'have'.

The Slovoed technology provides other useful language-learning tools, including:
— cross-references;
— favorite entries;
— search history;

Now introducing the Practical English Usage app: Michael Swan's vital reference tool that helps teachers and higher-level learners of English
The best English Dictionary there is. The content is top notch for
any English-speaking language enthusiast. Word Look Up using the
Share option on Marshmallow works in most applications. Thanks, Developers!
Download on Appstore
Excellent tool! The definitions and examples are very straightforward
and I find this ideal to use while I am on the go. It is well-worth
the money, and the functionality is quite good
Download at Google Play
This is my favorite dictionary! I use this application every single day!
It's truly amazing, cool features, idioms, definitions, opposite words,
similar words! Tones of great features.
Download on Windows Store
I like the way that I can learn English and American grammar as well! 
And also the feature of customizing the interface of the app with My View
is quite valuable for me. Definitely download this one!
Download on Mac Appstore