The order in which you write the documents for an ERC application is extremely important.
ERC proposals typically require: (1) a 15-page extended version; (2) a 5-page condensed version; and (3) a 2000-character abstract. If you write the condensed version first, you will find it extremely difficult to turn it into a well-written and convincing extended version without it looking ‘fluffed up’. If you work on both documents at the same time, you end up doing everything twice. Clearly, the extended version needs to come first, and be completed before you do the rest.
Once you have laid out your complete line of argument and all the important information in the extended version, and perfected the text, it will be very easy for you to then utilize all of the important elements to create a powerful and concise condensed version.
From there, the abstract presenting the ‘what’, ‘why’, ‘how’, ‘who’ and the expected ‘outcomes’ will come quite naturally, and capture the absolute essence of your proposal!