When using a collection or resource list of assessments, you need to make sure a. they include descriptions of the validity and reliability of the tool, as well as the population the tool was piloted or tested on. b. they come from a government or research organization. c. they rate usability. d. the child assessments you're selecting are ongoing assessments of child progress rather than screening or evaluation/diagnostic assessment tools. mark for review (will be highlighted on the review page)

The correct option is A.
Some measurement instruments are usually used in research, it is very important to know the validity and the reliability of such instruments and their suitability to the use to which they are put. The key indicators of the quality of a measuring instrument is the validity and the reliability of that instrument. Reliability refers to the extent to which an assessment tool produce stable and consistent results while validity refers to how well a tool measures what it claimed to measure. 

Answerquantity demanded of compact disc players has decreased///good luck

When two vehicles meet on a steep road where neither can pass: the vehicles going downhill must back up or simply must yield the right of way so it can pass : )