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Thanks a lot! "We" did it!

> I would like to create an LDT with words taken from 18 lists (9 word lists, 9 non-word lists, each lists contains 15 words --> 270
> words). They shall be shown in a random order.

Enter your 9 x 15 = 135 word items in <item category>. Enter your 9 x 15 = 135 non-word items in <item nonword>. Adjust the trial count accordingly:

<block lexicalDecisionTask>
/ trials = [1=instructions; 2-271=noreplace(ldtcategory, ldtnonword)]
</block>

Alternatively set up separate <trial>, <text> and <item> elements for each of your 9 "word" categories and each of your 9 "nonword" categories. I.e.

<trial ldtcategory1>
/ stimulustimes = [0=ready; 700=category1; 950=blank]
/ validresponse = ("E", "I")
/ correctresponse = ("I")
/beginresponsetime = 700
</trial>

<text category1>
/ items = category1
</text>

<item category1>
/ 1 = "category1_item1"
...
/ 15 = "category1_item15"
</item>

...

<trial ldtnonword9>
/ stimulustimes = [0=ready; 700=nonword9; 950=blank]
/ validresponse = ("E", "I")
/ correctresponse = ("E")
/beginresponsetime = 700
</trial>

<text nonword9>
/ items = nonword9
</text>

<item nonword9>
/ 1 = "nonword9_item1"
...
/ 15 = "nonword9_item15"
</item>

Run those trials via the <block> element in random order:

<block lexicalDecisionTask>
/ trials = [1=instructions; 2-271=noreplace(ldtcategory1, ldtcategory2, ldtcategory3, ldtcategory4, ldtcategory5, ldtcategory6, ldtcategory7, ldtcategory8, ldtcategory9, ldtnonword1, ldtnonword2, ldtnonword3, ldtnonword4, ldtnonword5, ldtnonword6, ldtnonword7, ldtnonword8, ldtnonword9)]
</block>

Please also complete the tutorials included in the Inquisit documentation to learn the basics of Inquisit syntax / how to set up procedures with it.