The facts in this case are not in *684dispute.1 Appellant Sarah Valt was injured in the course of her employment with appellee Woodall Industries, Inc. on Thursday, May 23, 1968. The injury to her hand, thumb and wrist, rendered her unable to return to work from Friday, May 24 until Monday, June 3 (a period of ten calendar days). At the time of her injury, appellant earned an average weekly salary of $111.36.
The employer and its insurance carrier voluntarily compensated appellant according to their interpretation of the Workmen’s Compensation Act, Part II, § 3;2 and Part II, § 9.3 They treated the days from May 24, 1968 to May 30, 1968, inclusive as a "waiting week” and paid no compensation for these first seven days. For the remaining days of Friday, May 31 through Sunday, June 2, plaintiff was paid 1/6 of her weekly compensation rate found in MCLA 412.9; MSA 17.159, for each day, excluding Sunday, that she was unable to work. For her period of disability, plaintiff was paid a total of $21.33 or 2/6 of the then correct maximum weekly compensation rate of $64 for a person in appellant’s earning and dependency status.
*685The employer filed the proper report with the Bureau of Workmen’s Compensation, notifying the Bureau of plaintiff’s injury and the payment of voluntary compensation in the amount of $21.33. Thereafter, as stated in the opinion of the Workmen’s Compensation Appeal Board:
"This report did not appear to be in conformance with the opinion entered by the Attorney General on May 27, 1968, in answer to a question concerning the interpretation of Part II of the statute. [Workmen’s Compensation Act] (Opinion No. 4612, Pg. 243 (1967-1968) Report of the Attorney General). The Director of the Bureau of Workmen’s Compensation did, pursuant to the provision of Rule 5 of the Bureau, schedule the matter for hearing and assigned the matter to a referee for resolution.”
In the proceedings before the hearing referee the parties immediately established their position on the two issues that are now before this Court for final resolution.
I. Is appellant-employee entitled to compensation for her first week of disability when she was absent from her place of employment, because of injuries, for a period of less than 14 calendar days?
II. Did appellee-employer compute the compensation that was paid according to a correct interpretation of the Workmen’s Compensation Act?
To simplify our discussion we proceed now to consider, in the order stated, these issues.
I
The parties agree that appellant was totally incapacitated as understood under Part II, § 9 of the Workmen’s Compensation Act for ten calendar days. The center of controversy in this first issue is the proper interpretation of Part II, §3, which *686controls the commencement of compensation. At the time of appellant’s injury, Part II, § 3 read:
"No compensation shall be paid under this act for any injury which does not incapacitate the employee for a period of at least 1 week from earning full wages, but if incapacity extends beyond the period of 1 week, compensation shall begin on the eighth day after the injury. If such incapacity continues for 2 weeks or longer or if death results from the injury, compensation shall be computed from the date of the injury.”4
Appellant Valt and the Workmen’s Compensation Appeal Board interpret this section to entitle appellant to compensation payments computed from the date of injury. Appellant first cites King *687v Davidson, 195 Mich 157, 159; 161 NW 841 (1917), in which this Court stated the proper guideline for construing the words of the Workmen’s Compensation Act:
"In construing this act, its words are to be taken and construed in the sense in which they are understood in common language, taking into consideration the text and subject-matter relative to which they are employed.”
Following the King guideline, appellant asserts that the first sentence of Part II, § 3, establishes a one-week waiting period as a condition precedent to eligibility for compensation. If during this one-week waiting period an employee is unable to earn "full wages” his right to benefit accrues and, if the incapacity from earning full wages continues beyond one week, compensation becomes payable on the eighth day after injury.
Since the Act speaks of incapacity from earning "full wages” rather than "any wages” appellant emphasizes that the injured employee is not required to forego all wages, only "full wages” to be eligible for compensation.
To read the first sentence of the section otherwise, appellant continues, would impart a "nugatory” meaning to the phrase "from earning full wages” and would both deviate from the "clear meaning” guideline and also violate another cardinal rule of construction which states that one provision of a statute should not be construed in such a manner as to render another provision of no effect. Transamerican Freight Lines, Inc v Quimby, 381 Mich 149; 160 NW2d 865 (1968). Cf. Melia v Employment Security Commission, 346 Mich 544; 78 NW2d 273 (1956).
The second sentence of the section makes com*688pensation payable from the date of injury whenever "such incapacity” continues for two weeks or longer. Under appellant’s construction "such incapacity” relates back to the incapacity described in the first sentence, namely, incapacity "from earning full wages”. Therefore, if the employee has been unable to earn his full wages for two weeks due to a job related injury, " * * * he is not required to forfeit compensation for the first week of incapacity — he is entitled to compensation from the date of injury, payments beginning on the eighth day after injury”. Applying this analysis to the present facts, appellant argues that she was unable to earn "full wages” during a period of two weeks and should have been compensated for the entire period of her incapacity including the first week thereof.
Appellees support their refusal to pay benefits for the first week of disability on the basis of prior administrative interpretation of the Workmen’s Compensation Act. They direct our attention to Rule 408.31 of the Workmen’s Compensation Commission5 and argue that this rule reflects the 50 years of past practice under the Workmen’s Compensation Act. From appellees’ account it appears that the past practice under the Workmen’s Compensation Act has been to aggregate an employee’s days of disability to complete the waiting week. A record is kept of all days, excluding Sundays, that *689are lost due to incapacity. When the total number of days reaches eight, compensation is paid for the eighth day and for any further days of incapacity. Thereafter, if the aggregate period of disability totals 14 days the employee "recaptures” compensation for the waiting week.
A statutory construction argument supportive of appellees’ position has been presented to us by amici curiae in this case. According to their analysis of Part II, § 3, the plain language of the section indicates that the proper meaning of incapacity is an "impairment” to perform the previous work which would earn the employee "full wages”.6
The employee’s impairment must extend beyond "a period of at least 1 week” for compensation to begin. The impairment must then continue — be maintained — for two weeks (14 days) or longer in order to recapture the first week’s benefits.
To further support their interpretation, amici curiae cites the rule of construction found in Melia v Employment Security Commission, 346 Mich 544, 562; 78 NW2d 273 (1956):
" 'No rule is better settled than, in construing a statute, effect must be given to every part of it. One part must not be so construed as to render another part nugatory, or of no effect. The same rule applies to words, in construing a sentence.’ ”
With this principle as a guide amici curiae argues that theirs is the proper construction of the disputed section.
''We submit * * * it is clear from statutory construction that the statutory term 'continues for two weeks’ *690has to be of greater duration than 'extends beyond the period of 1 week.’
"With such a diiference in language, it is not logical that the Legislature meant the two terms, as cited above, to be synonymous, as is argued by the claimant. It is not possible that disabling incapacity on the eighth day after injury would fulfill the requirements that the impairment of work activity 'continue for two weeks.’ Clearly, the Legislature did not intend that such impairment on the eighth day after injury would fulfill the statutory requirement of incapacity 'for two weeks.’ If this had been the intent, then there would not have been the necessity to incorporate the requirement of 'continues for two weeks.’ * * * [H]ad the Legislature intended that there be but 1 statutory waiting period and that incapacity merely on the eighth day would entitle one to both initial and both retroactive compensation, it could have provided that:
« ' * * * If jncapacity extends beyond the period of 1 week, compensation shall begin on the eighth day after the injury and thereupon be retroactive to the date of the injury.’ ” (Brief of Michigan Manufacturers Association, et al, Amici Curiae, pp 10-11.)
After the thorough examination of the arguments presented to us, we have concluded that Part II, § 3 of the Workmen’s Compensation Act should be read to grant appellant compensation for her first seven days of incapacity. Both appellant and appellees have presented us with reasonable interpretations of Part II, § 3. In our opinion, however, appellant’s position better reflects the primary purpose of the Workmen’s Compensation Act which is to provide compensation for disability from an employment related injury or disease to individual employees working in the pursuits subject to the Act. Wilson v Doehler-Jarvis Division of National Lead Co, 358 Mich 510, 516; 100 NW2d 226 (1960); Rookledge v Garwood, 340 Mich 444, 452; 65 NW2d 785 (1954); 24 Michigan Law & *691Practice, Workmen’s Compensation, § 2. Where, as in this case, it is possible to construe the same words of the Act to reach different results we must be especially mindful of the Legislature’s purpose in adopting the Act when we interpret its meaning. Cf. Commissioner of Insurance v American Life Ins Co, 290 Mich 33, 44-45; 287 NW 368 (1939); Kizer v Livingston County Board of Commissioners, 38 Mich App 239; 195 NW2d 884 (1972).
Accordingly, we read the words of Part II, § 3 to define incapacity in terms of an employee’s inability to earn his full wages, or more specifically his full average weekly wages.7 If his incapacity extends to the eighth day, the employee is entitled to compensation under the first sentence of the section; and, since his incapacity will of necessity have continued into the second week, he becomes entitled to compensation for the first week’s incapacity under the words of the second sentence of the section. This construction, we believe, provides an employee with the measure of compensation for wages lost as a result of work related injury that is consistent with both the primary purpose of the Workmen’s Compensation Act and the language of Part II, § 3.
Contrary to the argument of appellees such a construction of the section does not render its second sentence of no effect. It has always been the intention of the Legislature that the first week’s benefits should be recaptured if incapacity extends a given length of time. See footnote 4, supra. If the second sentence of Part II, § 3 were not present an employee under either party’s interpretation of the language of the first sentence, *692standing alone, would never be able to obtain compensation for his first week of incapacity. Perhaps the Legislature could have written the section in a more compact manner by changing a few words as suggested by amici curiae but it did not do so. The composition of a statute is the legislative function and beyond our scope of review.
On remand the Workmen’s Compensation Appeal Board is instructed to reenter its order awarding appellate $64 compensation for the days May 24, 1968-May 30, 1968, inclusive.
Before concluding this portion of the opinion, we feel compelled to respond to a statement contained in the opinion of Justice Coleman. Justice Coleman argues that interpreting the Workmen’s Compensation Act as we do in the present opinion will encourage an employee to "take off three or four extra and unnecessary days for a minor injury so that he could return to work on the eighth and receive compensation for the entire week.” Such an argument is, in our opinion, unfounded in fact and uncompelling in logic. Even assuming arguendo, Justice Coleman’s premise that an employee would feign continuing disability, there is no reason to conclude that our interpretation of the act will lead to more unnecessary work days lost than under her interpretation. Indeed, we believe that the interpretation of the act contained in the present opinion is more likely to induce an early return to work. With compensation being correctly paid from the date of injury commencing on the eighth day thereafter, an employee will receive a compensation amount related directly to his wage loss due to incapacity. He will not be tempted to prolong his absence from work to the fifteenth day so that he can recapture the first week’s benefits. It is our belief that interpreting the act as we do herein will foster a just distribution of the cost of *693injury and a speedy return of the injured employee to work.
II
The problem presented in this second issue is to determine the correct method for computing compensation when the period of total disability is less than a complete week (seven consecutive days). When compensation is being computed for a complete week of total disability, the parties agree that the employee is entitled to 2/3 of his or her average weekly wages subject to the maximum and minimum amounts set forth in Part II, § 9.
Part II, § 9 controls, in general terms, the compensation to be paid for total disability but does not itself specify the proper method for computing a fractional week’s benefits. In relevant part the statute stated:
"While the incapacity from work resulting from the injury is total, the employer shall pay, or cause to be paid as hereinafter provided, to the injured employee, a weekly compensation of 66-2/3% of his average weekly wages, but not more than * * * $64.00 * * * if such injured employee has no dependents; * * * ”
The appellees have steadfastly argued in the proceedings below that administrative past practice and customs should be given great weight in determining the proper computational method under this statute.8 In specific terms appellees would *694have us conclude, as did the Court of Appeals at 39 Mich App 199, 217-218; 197 NW2d 297 (1972), that the weekly compensation amount listed in Part II, §9 should be divided by the number of days in the employee’s work week and the resulting daily rate multiplied by the number of work days lost due to total disability. Thus, in the present case, the employer divided the applicable compensation rate of $64.00 by six days2 345***9 to obtain a daily rate of $10.66 which was then multiplied by the two work days plaintiff lost, to obtain a total compensation of $21.33.10
In contrast appellant has maintained throughout these proceedings that compensation must be computed on a weekly rather than a daily basis. According to her analysis, adopted by the hearing referee and the Workmen’s Compensation Appeal Board, the statute itself calls for a weekly compensation and makes no reference to a daily rate. Therefore, whenever an employee is unable to work as a result of total disability for a fraction of a week, the employer must compensate at the full applicable weekly rate found in Part II, § 9 subject *695to the proviso of Part II, § 1111 which reads in part:
"The weekly loss in wages referred to in this act shall consist of such percentage of the average weekly earnings of the injured employee computed according to the provisions of this section as shall fairly represent the proportionate extent of the impairment of his earning capacity in the employment in which he was working at the time of the injury, the same to be fixed as of the time of the injury, but to be determined in view of the nature and extent of the injury. The compensation payable, when added to his wage earning capacity after the injury in the same or another employment, shall not exceed his average weekly earnings at the time of such injury. ’’(Emphasis added.)
Applying appellant’s method of computation to the present facts leads to the following result. Under Part II, § 9 she was entitled to compensation at the rate of $64 per week subject, however, to the proviso of Part II, § 11. Under that section appellant’s actual earnings for the portion of the week (the remaining part of the seven-day period concluding on Thursday, June 6, 1968) that she was able to work, or $73.22, must be combined with the $64 to insure that appellant will not receive a total amount of compensation plus wages that exceeds her average weekly wage of $111.36. Here, the sum of the compensation and actual wages was $137.22 which did violate the proviso. Therefore, the $64 compensation must be reduced to an amount that when added to her earned wages will not exceed $111.36. Appellant claims she should have received compensation in the amount of $38.14.
In our opinion appellant’s analysis presents the proper construction of these statutes. She correctly observes that all relevant portions of the Work*696men’s Compensation Act speak in terms of weekly rather than daily compensation rates. Her analysis fits well with our belief that the Act should be construed so as to provide an injured employee the full measure of compensation appropriate under the plain language of the Act. The past practice of the administrative agency charged with the interpretation of a statute is entitled to substantial weight in our judicial review, Magreta v Ambassador Steel Co, 378 Mich 689; 148 NW2d 767 (1967), reh, 380 Mich 513; 158 NW2d 473 (1968), but cannot alone support an improper interpretation of the statute, especially, when that interpretation has been expressly rejected by the administrative tribunal charged with the responsibility of reviewing the decisions of the administrative agency.12
*697Therefore, we hold that for a period of total disability less than a full week, Part II, § 9, requires compensation to be paid on a weekly basis subject to the máximums and minimums contained therein and also subject to Part II, § 11.13
The Court of Appeals is reversed and the case is remanded to the Workmen’s Compensation Appeal Board for the entry of an order not inconsistent with this decision.
T. M. Kavanagh, C. J., concurred with Swain-son, J,The parties entered into the following stipulation of facts before the Bureau of Workmen’s Compensation hearing referee:
"It is stipulated that the following are the operative facts in the case:
"Claimant received an injury arising out of and in the course of her employment with the Defendant on May 23, 1968. At the time of her injury, her average weekly wage was $111.36. Due to her injury, she did not and could not return to employment until June 3, 1968. The employer, through his [sic] insurance company, paid compensation benefits for the last two days of disability. Payment was based on a daily rate of $10.655 compensation computed through dividing the weekly rate of $64.00 by six. Thus, the Claimant received compensation in the amount of $21.33.
"It is stipulated that this case does not put into issue the right of the Claimant for any possible future benefits under the act.”
MCLA 412.3; MSA 17.153, now reenacted in MCLA 418.311; MSA 17.237 (311).
MCLA 412.9; MSA 17.159, now in relevant part, MCLA 418.351; MSA 17.237 (351).
Part II, § 3 has undergone a gradual reduction of waiting periods since its original adoption in 1912. As enacted in 1912 PA (1st Ex Sess) 10 the section read:
"No compensation shall be paid under this act for any injury which does not incapacitate the employee for a period of at least two weeks from earning full wages, but if incapacity extends beyond the period of two weeks, compensation shall begin on the fifteenth day after the injury: Provided, however, That if such disability continues for eight weeks or longer, such compensation shall be computed from the date of injury.”
The section was next amended by 1919 PA 64 to read:
"No compensation shall be paid under this act for any injury which does not incapacitate the employee for a period of at least one week from earning full wages, but if incapacity extends beyond the period of one week, compensation shall begin on the eighth day after the injury: Provided, however, That if such incapacity continues for six weeks or longer or if death results from the injury, compensation shall be computed from the date of the injury.”
The section remained in the same form and was modified by 1943 PA 245 to reduce the length of incapacity required to recapture the first week’s compensation from six weeks to four weeks. The next amendment of the section was accomplished by 1965 PA 44. The amended section is quoted above in the body of this opinion. At the present time as a result of 1969 PA 317 the section has been slightly modified to read:
"No compensation shall be paid under this act for any injury which does not incapacitate the employee from earning full wages, for a period of at least 1 week, but if incapacity extends beyond the period of 1 week, compensation shall begin on the eighth day after the injury. If incapacity continues for 2 weeks or longer or if death results from the injury, compensation shall be computed from the date of the injury.”
"R 408.31 Rule 1. Reports.
"(1) An employer shall report immediately to the bureau on form 100 all injuries, including diseases, which arise out of and in the course of the employment and result in:
"a. An aggregate of 7 or more days of disability not including Sundays or the day of injury.
"b. Death.
"c. Specific losses.
"A copy of the report shall be given immediately to the injured employee.”
The Court of Appeals interpreted "incapacity” in a similar manner. See, Phipps v Campbell, Wyant & Cannon Foundry (Valt v Woodall Industries, Inc), 39 Mich App 199, 217; 197 NW2d 297 (1972).
See Part II, § 11, now recodified in MCLA 418.371; MSA 17.237(371).
As an example of the administrative interpretation of the Workmen’s Compensation Act hy the Bureau of Workmen’s Compensation, appellee cites two tables entitled "Daily Compensation Rate” first published by the Bureau in 1966. According to these tables, which were used in this case by appellee, an employee with a weekly compensation rate of $64.00 would receive the following compensation per day when based on a six-day week:
1 day — $10.67
*6942 days — $21.33
3 days — $32.00
4 days — $42.67
5 days — $53.33
Maximum weekly amount — $64.00
Appellees state in their brief at pages 33-34:
" * * * [T]he payment of total disability benefits of less than a week on the basis of l/6th of the appropriate rate for each day, except Sunday of disability is a practice of long-standing. It is evident from its long-standing that the practice began when the usual work week was six days.”
From the point of view of our present analysis, we choose to disregard any distinction between applying a daily rate based upon a six-day week or a five-day week. The feature of appellees’ method of computation that we must here examine is the practice of paying, in general terms, a daily rather than a weekly rate of compensation.
See stipulation of facts, p 684, supra.
MCLA 412.11; MSA 17.161(1), now reenacted in MCLA 418.371; MSA 17.237(371).
In the present case the Appeal Board concluded from reading the Act that:
"Many methods of paying an employee for his services are utilized by employers. Some employees are paid by the hour, some by the week, some by the month, some by the year, and others are even paid by the amounts produced or sold. Obviously, the Legislature could not enact a reasonably simple statute which would permit a means of weighing the wage loss occurring because of the injury and then fairly compensate for this wage loss without somehow converting all these different methods of payment for services rendered to some kind of a standard for the purpose of determining the loss occasioned by injury and compensating therefor.
"The Workmen’s Compensation Act simply makes too many references to a weekly loss and a weekly payment to believe that the Legislature intended the use of any standard other than that of a weekly basis in ascertaining the loss and the payment of compensation therefor. Throughout Part II which provides the method of payment of compensation the exclusive standard referred to is a weekly computation. The wages earned at the time of injury is by statutory enactment in Section 11, Part II, converted to a weekly wage. Furthermore, Section 11, Part II provides that, 'The weekly loss in wages * * * shall consist of such percentage of the average weekly earnings * * * as shall fairly represent the proportionate extent of the impairment of his earning capacity in the employment in which he was working at the time of injury, * * * ’ This enactment which provides the method of determining the compensable loss permits no standard other than that of the weekly basis for determining the loss.” Valt v Woodall Industries, Inc, 1970 WCABO 1337, 1340. See also, Lundmark v J A Fredman, Inc and Liberty Mutual Insurance Co, 1967 WCABO 534.
Although a question has been raised in these proceedings regarding the applicability of Part II, § 11 to Part II, § 9, we find that the issue has been resolved in prior cases. MacDonald v Great Lakes Steel Corp, 268 Mich 591; 256 NW 558 (1934), clearly holds that the sections should be jointly applied to determine an employer’s compensation payment to an injured employee. Compare also, Halas v Yale Rubber Manufacturing Co, 381 Mich 542; 164 NW2d 15 (1969) and Liesinger v Owen-Ames-Kimball Co, 377 Mich 158; 139 NW2d 706 (1966).