search terms and field codes can be altered within current ... web viewmap to thesaurus produced...
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Category Old HDAS New HDAS Rationale for change
PubMed (general)
This database could only be searched when the user was not logged in.
This database can now also be searched when logged in.
User can now add results from PubMed to ‘saved results’. Advantage is that PubMed contains very recently published material, such as articles published online ahead of print.
PubMed fields Only Title, and Title and text (all fields) could be searched.
There is now a greater selection of fields.
A more advanced/precise search can be developed.Note: the following search features are not available in PubMed:Limits (e.g. Date, Language)Thesaurus (MeSH headings)
Editing searches Search terms or field codes could not be edited within search history: a new search would have to be run and the unwanted one deleted.
Search terms and field codes can be altered within current strategy. Users need to click Update to complete the process.
Note: if a user alters a search line which has been combined with another search, the result row of the combined search will be updated automatically
This means users do not have to take extra steps by retyping, re-running and deleting search lines for the sake of changing terms or field codes.
Adding limits to a search
Click ‘Apply Limits’ in Search History.Select one or more limits from the ‘Limits’ area of the screen.To apply limits, click the Search button.
Add limits within current strategy as follows:1. Click the ‘Edit’ link.2. Click ‘Edit limits’3. Ensure the Check Box to the left of
Essentially, in terms of adding limits to individual searches, little has changed, but the Search button now says Update.
Old HDAS vs new HDAS October 2016
Category Old HDAS New HDAS Rationale for change
‘Limits’ is ticked. Click on the appropriate filter group label (such as ‘Article Type’, ‘Date’) and select options 4. Go to the search box. Users will see that the search terms are there. Click the Update button. 5. Details of the amended search should then appear in the ‘Current Strategy’ area.
Adding limits to a combined search row
Click Apply Limits; add limits and then click Search.
Users will see that the number of the search to which the limits are applied is in search history.
1. heart attack2. outcome3. 1 AND 2
In the search strategy, there is no Edit option for row 3.To apply a limit to row 3: Type 3 into the search box Ensure the Limits tick box is selected Select the limits you want to apply Click SearchUsers know a limit has been applied because the name of the limit group is highlighted green. Then click the Search button. The syntax will be shown on the results page and in current strategy.
In practice it is the same, the only thing that has changed on new HDAS is that you enter the search number first.
Old HDAS vs new HDAS October 2016
Category Old HDAS New HDAS Rationale for change
Combining rows with limits already applied
1. Heart attack limited to male2. Outcome limited to aged 80 and
over
Users could combine these 2 rows to get a results set.
Users cannot combine rows that have limits already applied.USers need to search for their terms without limits, combine the rows, then apply limits at the end (see above).
The old version of HDAS is inconsistent in how combine works, and applies both limits to both search rows, which might not be what the user intended. The way in which data is received from the database suppliers means that in order to get an accurate set of results, with the limits applied as the user intends, limits need to be applied at the end of combining the search rows.
Combining rows from multiple database searches
Users could select multiple databases, run searches and combine the search row.
Users cannot combine rows that have been run across multiple databases
Although the old version of HDAS looks like it was doing this, the results sets were not always combining properly. This is due to the way old HDAS batches sets of results. Different databases use different systems for ordering the results that are returned, so old HDAS was inconsistent in the way it did this. Because of these differences, we’ve found that it isn’t possible to combine search rows from multiple databases and give accurate results.
Syntax: optional wildcard
Use one symbol only for this operator across the 8 database in new HDASIt is not practical (or intuitive) to honour
Old HDAS vs new HDAS October 2016
Category Old HDAS New HDAS Rationale for change
?colo?r finds colour, color
the syntax of each database / provider, especially as providers can change.
Syntax: mandated wildcard #nurs# finds nurse
Use one symbol only for this operator across the 8 database in new HDAS
Thesaurus Map to thesaurus produced list of suggested terms (as did browse!)
One button only matches the users’ query to a thesaurus term.
Analysis showed that the browse button on old HDAS was underused and the mapping feature was popular, indicating it was better to just have the one button to access thesaurus headings.
Thesaurus HBEThesaurus only available if you entered a term and clicked Browse thesaurus.
HBEHBE thesaurus available via the standard Thesaurus button
Thesaurus Tree display as supplied by APIs/Gateways – not consistent.
Terms on the same level within the immediate part of the tree (AMED …) are shown as ‘sibling’ terms
Greater uniformity across thesauri in terms of presentation/design pattern.
Old HDAS vs new HDAS October 2016
Category Old HDAS New HDAS Rationale for change
Thesaurus searches
Can select more than one thesaurus term from the thesaurus display, combining them with OR, AND, but they are displayed as a single query (line) in search history.
Can choose to search each term as individual queries so they appear on a separate line (one query per line) in current strategy area
Enhancement: benefits advanced searches.
Thesaurus – navigation
The breadcrumb trail was NOT clickable. However you could see more of a thesaurus in one go.
In order to move to more specific terms click those which are narrower. You can see these most easily when you click the number in the column headed ‘narrower’ to the right of the screen.To move up a level and see associated sibling, broader, narrower terms use the breadcrumb in the top left-hand side of the screen.
Greater consistency across databases.Different providers present thesauri differently
View results (multi-database search)
Results from more than one database can be seen within a single view.
Results are presented in multiple tabs: one tab per database.
Users do not have wait for the results from the slowest provider to be returned before being able to view their results.
Saving results Save to clipboard, then export/email from there.Clipboard is temporary.
Create sets of saved results, which are permanent until users decide to delete them.
Clipboard was unreliable. Saving sets of results to work with increases the reliability and functionality.
Saving results If user tries to add duplicated results to The system doesn’t allow users to add The functionality is the same.
Old HDAS vs new HDAS October 2016
Category Old HDAS New HDAS Rationale for change
the clipboard on-screen message reads: ‘The site says … 0 results added to clipboard, 2 results duplicate existing clipboard content’.
the same result into a saved results set more than once – but does not give specific notification of this.
Saving results Occasionally the number of results actually saved may be lower than the number you selected to save.
Each record from each database is given a unique identifier number. Occasionally these IDs from the providers are duplicated in the record. HDAS detects this and automatically assumes that they are duplicate records, so only saves one copy of the record.
Viewing search results
Users had to click the result count in ‘search history’:
Results are displayed once the search has finished running; in current strategy, you will see the word Viewing to the left of the results count once the search has finished running:
Pre-development research showed that users were confused as to how view results of the search they had just carried out.
Full-text links All full-text links for an article are displayed, such as in this example in MEDLINE:
In the new HDAS, we display no more than 2 full-text links.
It is not helpful to show multiple links which ultimately lead you to the same full-text article, which is what the user
Old HDAS vs new HDAS October 2016
Category Old HDAS New HDAS Rationale for change
If the user wants to see all available full-text links, they can click the More full-text links option – see below (same record as left):If you click the More full-text links link then you will see the other options: Highwire Press, and National Library of Medicine visible on live HDAS
wants to see.Also, displaying more than 2 links increases scrolling and distracts attention from citation/bibliographic data.Links to National Content are displayed first - there is a priority rationale here.
Results (full-text availability)
There is no way of creating a distinct view for results available as full-text.
If you click the Expand Full-Text button you will notice that only those results with full-text links display all citation data and full-text links. Also note there is a light grey ‘book’ icon towards the right of the screen (level with the title).
Also in this view, only the title shows for those articles for which there is no full-text availability. You can see the rest of the citation data of these results if you
The user research phase showed that users wanted to restrict the results view to full-text items.
Old HDAS vs new HDAS October 2016
Category Old HDAS New HDAS Rationale for change
click the upward chevron to the right of the screen (same level as screen).
De-duplication Results sets can be de-duplicated: search history offers the option to view unique and duplicate results.You have to view the unique and duplicate records separately, as a complete ‘set’.Could not make a direct comparison between the ‘original’/unique result and the corresponding duplicate.User can’t delete any of the results – you would either add them to clipboard or simply not export/e-mail them.
Cannot de-duplicate result sets directly – need to save results into a set of Saved Results.Duplicates are automatically detected in Saved Results. The following on-screen feedback is given:(1)The set is ‘free of duplicates’(2) 1 of your saved results have duplicate entries. To view the results identified as duplicates click the link: View only the 1 results with duplicate entries.The user can then click the hyperlink Delete selected, OR:Select either record, and click Delete selected.
In old HDAS, the result set is ‘temporary’. The feature was unreliable in the old version of HDAS.
User can now make informed decision as to whether an item is a duplicate or not because both the ‘original’ record and the duplicate one are shown alongside each other. The duplicate result will be shown (with red background). The display of both records enables users to check metadata such as author, title, name of the journal and page numbers systematically.
Deduplication – maximum
The maximum number of records that could be deduplicated was 500.
There is no limit.
Old HDAS vs new HDAS October 2016
Category Old HDAS New HDAS Rationale for change
Recovered searches
If users run a recovered search then it will automatically return the latest results count
Users have to re-run searches to refresh the result count – users need to click the ‘View Results’ link to see an up-to-date results count.Note: Recovered searches are in: My Search Strategies > Strategy History Tab
The search can be preserved as the user has left it: this assumes the users have to break off due to other duties or network failing.
Old HDAS vs new HDAS October 2016