While borrowing, adaptation, and reinterpretation are common processes in writing system change due to language contact, the development of a completely new writing system is typically not a direct result of language contact.

Adaptation refers to the process by which a language modifies an existing writing system to suit its own needs, often involving changes in the representation of sounds, the addition of new characters, or the modification of existing ones.

Vietnamese is an example of a language that has adapted the Latin alphabet to represent its writing system, incorporating diacritics and tone marks to represent the unique features of its phonology.

Convergence refers to the process by which two or more writing systems influence each other, often due to prolonged contact between the languages they represent, leading to the emergence of a new writing system that incorporates elements from both.

Hangul, the writing system of the Korean language, is an example of a writing system that emerged as a result of convergence between multiple writing systems, including Chinese characters and Mongolian scripts.

Replacement refers to the process by which a writing system is abandoned in favor of another writing system, often due to political, social, or cultural factors, resulting in the discontinuation of the original writing system.

Turkish is an example of a language that has replaced its original writing system, the Ottoman Turkish alphabet, with a new writing system based on the Latin alphabet, as part of a broader modernization effort in the early 20th century.

Polysystemicity refers to the process by which a writing system is used to represent multiple languages, often due to historical, cultural, or political factors, resulting in a single writing system being used for different languages with varying degrees of adaptation.

Latin is an example of a writing system that is used to represent multiple languages, including English, Spanish, French, Italian, Portuguese, and many others, due to its widespread adoption and historical influence.

Transliteration refers to the process by which a writing system is used to represent a language that it was not originally designed for, often involving the substitution of characters or symbols from the original writing system with those from the new writing system.

Sanskrit is an example of a language that has been transliterated into a different writing system, specifically the Roman alphabet, for the purpose of academic study and wider accessibility.

Adaptation refers to the process by which a writing system is used to represent a language that is closely related to the language it was originally designed for, often involving minor modifications to accommodate the phonological and grammatical differences between the two languages.

Spanish is an example of a language that has been adapted from a closely related language's writing system, specifically the Latin alphabet, with minor modifications to accommodate the unique sounds and features of the Spanish language.

Digraphia refers to the process by which two or more writing systems coexist in a single language, often due to historical, cultural, or political factors, resulting in the use of different writing systems for different purposes or in different contexts.

Japanese is an example of a language that exhibits digraphia, with the use of three writing systems: kanji (Chinese characters), hiragana, and katakana, each serving different purposes and contexts in the written language.