Face validity refers to the degree to which an assessment or test subjectively appears to measure the variable or construct that it is supposed to measure. In other words, face validity is when an assessment or test appears to do what it claims to do.
Step 2: Using an electronic detector, check that the area of wall where you plan to hang the shelves is free from hidden pipes or cables. Step 3: Place your first bracket against the wall, using a spirit level to make sure it's level. Mark the fixing-hole positions with a pencil.Step 4: Using the pencil marks, drill holes into the wall.crew the bracket into place. Step 5: Slide the shelf onto the bracket to check that it's level (use the spirit level to make sure). Once you're happy with the position of this shelf and the way it looks, slide it back off the bracket so that you can position the rest of the brackets.
To do this you will need a few tools though. The wood you use to build your shelves will depend on the height of your ceilings and the size of your wall. But if you follow the general plan Iâve given you in the picture above you can adapt them to build shelves to your heartâs content.o attach the wood to other wood, you just need to use 4â³ wood screws. I had leftover decking screws, so thatâs what I used. I used up a lot of crap doing this project actually. For extra, added security you can run a length of wood across your wall.